I have a short questions regarding a parallelism
The question is as follows:
Answer choices are: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 inventories turnovers can be
B) the frequency of inventories 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
I thought the right solution is D because I spottet the parallelism marker "and" ("items are placed on shelves" needs to be parallel with "frequently is the inventory turned over"). I thought so because I saw a passive construction "items are placed" and looked for a passive construction in the answer choices -> "inventory turned over".
But why is the right answer E?? Why is "the inventory turns over" parallel to "are placed on shelves"?? (-> "turns" parallel to "placed"!!??)
Can somebody please help me out with this?
Thanks a lot for your answers.
Best regards,
nobody