It should be discretionary calories. im sorry if i'm wrong!
<span>An example of concentric contraction is doing a biceps curl. The curl exercise is targeting the biceps muscles on the front of the upper arm and only several muscles assist during the movement. Moreover, concentric muscle contraction is a type of muscle activation that increases the tension on a muscle as it shortens and this activation begins the process of muscle strengthening and hypertrophy. </span>
I believe the correct answer is A , but I am not 100% sure , hope I helped (:
