Which of the following provide the most readily available energy?
carbohydrates
lipids
nucleic acids
proteins

Option A, Carbohydrates

Explanation:

Carbohydrates can be easily and quickly broken down into simple sugar such as glucose, fructose, and galactose which are used as a source of energy.  

The unused carbohydrates are stored in the form of glycogen with in the muscle and liver and can be used in future based on requirement. Usually, energy from glycogen is used during intense exercises and workouts.  

Hence, option A is correct

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics