What Recommendation Should Be Made to a Recreational Athlete Who

What recommendation should be made to a recreational athlete who is interested in supplementing with branched-chain amino acids?

A) Food sources of protein and amino acids may provide basically the same effects at a fraction of the cost.
B) Amino acid supplementation is most effective just prior to an endurance workout.
C) Research is showing conclusive evidence of the ergogenic effects of amino acid supplementation.
D) Little is known about the role that branched-chain amino acids play in muscle building.