It is well known in the supermarket industry

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It is well known in the supermarket industry

by Vincen » Sun Sep 10, 2017 12:28 pm
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

The OA is E.

I would choose the option B. Can some experts clarify it to me?