What is the purpose of breathing exercises?
a. to release endorphins
b. to release adrenaline
c. to settle the body and mind
d. to decrease your sense of awareness

The answer is C. Breathing exercises helps the body with the lungs and gives more oxygen to the brain to think more clearly and calmly, thus to "settle" the body/mind.

It is clearly not D because breathing exercises has no negative effects like "decreasing sense of awareness", that is just absurd.
A and B are not true and endorphins and adrenaline are not released during breathing exercises.

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it should be