When an Exercise Involves Using the Same Muscle Group to Lift

When an exercise involves using the same muscle group to lift and lower a constant load, such as flexing and extending the elbow while standing and holding a weight, which of the following is correct about the effect of this exercise on the tension generated by the musculature?

A) Greater muscle tension develops when the weight is lowered (controlled by an eccentric contraction) than when it is lifted and controlled by a concentric contraction.
B) When the weight is lowered (controlled by an eccentric contraction) , fewer motor units are recruited, and thus less tension is generated, than when the weight is lifted (controlled by a concentric contraction) .
C) The same tension is generated in the muscle during the lifting and lowering phases of the exercise because the greatest resistance (load) is imposed by the weight at the same point in the ROM.
D) Greater energy expenditure is necessary during the eccentric phase of the exercise than during the concentric phase.