A. They allow for a better peak contraction.
B. They recruit the rear delts.
C. They better target the upper lats.
D. They better recruit the biceps, which allows you to train with heavier loads.
Because your elbows stay tight to your sides during reverse-grip exercises, they better focus on the lower lats, not the uppers. Both overhand and reverse-grip rows recruit the rear delts. The reverse-grip hand position calls the biceps into play to a greater degree, which for most lifters means that they can use slightly heavier weights. Answer D is correct here.