While recognizing that lying often facilitates social ineractions, psy

Sentence structure is

While recognizing {Psychiatrists are recognizing} that lying often facilitates A, Psyhciatrists are seeking to determine when lying/social interactions will facilitate P and Q.

Now While introduces simultaniety of events. Passage talks about lying and its first effect in the Dependent clause {While......social interactions,} so for simultaniety we have to again see what lying will cause or facilitate or becomes in the other event. So lying will be better to be assumed as the referent of pronouns used in the Independent clause {Pshychi....signal.}

Moreover Social interactions can very well be the referent of they in the Independent clause. Because logically Social interactions can become destructive {as Facebooking can be by killing time} as well as it can cause mental problems {ADD etc.} but the sentence demands while A leads to B, A can also lead to P & Q.

R.

I'm just going to denote the difference between D and E that helped me understand why E is preferred

D - While recognizing that lying often facilitates social interactions, psychiatrists are seeking to determine when it becomes destructive and the mental problems that are signaled by it.
E - While recognizing that lying often facilitates social interactions, psychiatrists are seeking to determine when it becomes destructive and which kinds of mental problems it can signal.


Obviously i'm justifying here, but the meaning of the sentence is that psychiatrists are trying to determine two things (1) WHEN and (2) THE TYPES OF MENTAL PROBLEMS

AND signals parallelism and E clearly places two relative pronouns (WHEN) and (WHICH) in parallel to communicate the two things psychiatrists are seeking to determine.

D's structure is relative pronoun (WHEN)....AND... NOUN (the mental problems)

The WHEN and WHICH correctly modify the infinitive "to DETERMINE" and act as ADJECTIVES.

"Lying ..." & "interactions" how can we differ from them?

Choice D also changes the meaning of the sentence a bit. The main sentence talks about the "kinds" of mental illness and this distinction is missing in Choice D.

In this question, "lying" is the subject, thus, A), B), & C) are out since these sentences contain "they". E) is chosen because of the parallelism of "when" and "which".

In this question, "lying" is the subject, thus, A), B), & C) are out since these sentences contain "they". E) is chosen because of the parallelism of "when" and "which".

I understnad that option E is correct as it is grammatically correct. Is use of WHICH correct? Had it been WHAT instead of which, would the answer choice still be correct?

isn't which used for singular cases

Grammar aside, isn't the following sentence correct Arindam?

Which books do you need?