Sentence Correction

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

First: Parallelism=> How x and how Y is the paralleism. We can eliminate the option A, B, and C.

We are left with D and E.

In the option D, "how frequently is the inventory turned over" is a problem. We know, auxiliary verb is usually used after subject. In case of interrogative sentence, we use auxiliary verb before subject. In the option D, the auxiliary verb "is" has been wrongly used before verb. We are left with E.
Answer is E.

excellent gmat_perfect .little correction i think :

In the option D, "how frequently is the inventory turned over" is a problem. We know, auxiliary verb is usually used after subject. In case of interrogative sentence, we use auxiliary verb before subject. In the option D, the auxiliary verb "is" has been wrongly used before verb. We are left with E.

bolded part should be "before subject" not "before verb" .

Frankenstein wrote:Hi,
If you haven't already noticed, it was corrected in the next post by GMAT MadeEasy.

excellent gmat_perfect .little correction i think :

In the option D, "how frequently is the inventory turned over" is a problem. We know, auxiliary verb is usually used after subject. In case of interrogative sentence, we use auxiliary verb before subject. In the option D, the auxiliary verb "is" has been wrongly used before verb. We are left with E.

bolded part should be "before subject" not "before verb" .

HarryPotter wrote:It is well known in the supermarket indeustry 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

Please let me know the difference between d. and e. in depth.

lunarpower wrote:gmatguru:

GMATGuruNY wrote:In D, the structure how + to be + subject implies a question: how frequently IS the inventory turned over? To make a statement, the structure needs to be how + subject + verb, as in answer choice E: how frequently the inventory TURNS OVER. Eliminate D.

this is correct.

i want to emphasize this pattern for a very specific reason: many posters on this board don't put nearly enough effort into pattern recognition, i.e., recognizing the general structure or "look" of certain constructions. i.e., many people here tend to look at nothing except the smallest components of a sentence.
as proof of this assertion, i will note that there are many, many posters on this board who still don't write questions correctly even after posting over a thousand times!
for instance, many posters will ask questions like this:
"Why A is wrong?"
"Why this idiom is incorrect?"
as mitch has pointed out here, you can't write questions like this; questions are not written in this way.
the error is quite understandable at first -- this is how non-interrogative sentences (i.e. everything except questions) are written, so it's understandable that people would write questions in the same way at first. however, if people are still doing this after 1000 posts, that's a strong indicator that they just aren't paying attention to key overall structures.