Geetanshu
Please can you give me the reason to analysis why answer D is correct and not E. I'm unable to find errors in answer E
Unfortunately, the biggest issue with (E) is probably the idiom. We could say that "subjects are
capable OF using something" or that "subjects are
able TO use something"; however, "are
capable TO use something" doesn't work. (Fortunately, it's rare that idioms are 100% unavoidable in an official GMAT question. More on that
here.)
However, if you were unsure about the idiom, you could also think about logic of the verb tenses, as
sayanta mentions earlier in the thread.
(E) contains the phrase, "subjects are capable to use thought transference." Now we have the present tense "are." Does that mean that the experiment is happening now? That we're expressing a universal truth about subjects everywhere? Neither interpretation really makes sense.
(D), on the other hand, contains the phrase, "subjects
could identify a card." At least in this context, "could" is a past tense verb, which makes more sense than the present tense "are capable".
I hope that helps!