Palpitation is when the heart shows signs of irregular rhythm; it can be a symptom of an underlying heart condition. Identify the Grammar Checklist error in the sentence above.
Select one:
A. NO ERROR
B. Misplaced modifier
C. Adjective usage
D. Is when

Overview

Heart palpitations (pal-pih-TAY-shuns) are feelings of having a fast-beating, fluttering or pounding heart. Stress, exercise, medication or, rarely, a medical condition can trigger them.

Although heart palpitations can be worrisome, they're usually harmless. In rare cases, they can be a symptom of a more serious heart condition, such as an irregular heartbeat (arrhythmia), that might require treatment.

Symptoms

Heart palpitations can feel like your heart is:

Skipping beats

Fluttering rapidly

Beating too fast

Pounding

Flip-flopping

You might feel heart palpitations in your throat or neck as well as your chest. They can occur when you're active or at rest.

When to see a doctor

Palpitations that are infrequent and last only a few seconds usually don't need to be evaluated. If you have a history of heart disease and have palpitations that occur frequently or worsen, talk to your doctor. He or she might suggest heart-monitoring tests to see if your palpitations are caused by a more serious heart problem.

Seek emergency medical attention if heart palpitations are accompanied by:

Chest discomfort or pain

Fainting

Severe shortness of breath

Severe dizziness

Request an Appointment at Mayo Clinic

Causes

Often the cause of your heart palpitations can't be found. Common causes include:

Strong emotional responses, such as stress, anxiety or panic attacks

Depression

Strenuous exercise

Stimulants, including caffeine, nicotine, cocaine, amphetamines, and cold and cough medications that contain pseudoephedrine

Fever

Hormone changes associated with menstruation, pregnancy or menopause

Too much or to little thyroid hormone

Occasionally heart palpitations can be a sign of a serious problem, such as an overactive thyroid gland (hyperthyroidism) or an abnormal heart rhythm (arrhythmia).

Heart rhythm changes (arrhythmias) might cause a very fast heart rate (tachycardia), an unusually slow heart rate (bradycardia), a normal heart rate that varies from the usual heart rhythm or combination of the three.

Risk factors

You might be at risk of developing palpitations if you:

Are highly stressed

Have an anxiety disorder or have regular panic attacks

Are pregnant

Take medicines that contain stimulants, such as some cold or asthma medications

Have an overactive thyroid gland (hyperthyroidism)

Have other heart problems, such as an arrhythmia, a heart defect, previous heart attack or previous heart surgery

Complications

Unless a heart condition is causing your heart palpitations, there's little risk of complications. For palpitations caused by a heart condition, possible complications include:

Fainting. If your heart beats rapidly, your blood pressure can drop, causing you to faint. This might be more likely if you have a heart problem, such as congenital heart disease or certain valve problems.

Cardiac arrest. Rarely, palpitations can be caused by life-threatening arrhythmias and can cause your heart to stop beating effectively.

Stroke. If palpitations are due to a condition in which the upper chambers of the heart quiver instead of beating properly (atrial fibrillation), blood can pool and cause clots to form. If a clot breaks loose, it can block a brain artery, causing a stroke.

Heart failure. This can result if your heart is pumping ineffectively for a prolonged period due to an arrhythmia, such as atrial fibrillation. Sometimes, controlling the rate of an arrhythmia that's causing heart failure can improve your heart's function.

Explanation:

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,

i don't think it's a good idea to threaten anyone at all.