adamk wrote: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 -- Not parallel with "how items are placed".
(B) the frequency of inventory turnovers is often -- "is" is incorrect as there are two subjects (inventory turnover and items placed)
(C) the frequency with which the inventory turns over is often --- "Is" is incorrect.
(D) how frequently is the inventory turned over are often --- "is the inventory turned over" is incorrect. Use of new word "often" is not justified here.
(E) how frequently the inventory turns over can be
--- Correct. Parallel with "how items are placed". Use of "can be" is correct.
OA after discussion.