It is well known in the supermarket industry that how items are placed on shelves and the frequency of
inventory turnovers can be crucial to profits.
(A) the frequency of inventory turnovers can be
(B) the frequency of inventory turnovers is often
(C) the frequency with which the inventory turns over is often
(D) how frequently is the inventory turned over are often
(E) how frequently the inventory turns over can be
Elim ABC b/c need to maintain ||ism with "how"
D: I think this changes the meaning from can be to often.
E: less wordy and clear.