GMAT Sentence Correction (SC) | Re: Because memory weakens with age - compare to vs compare with

Because memory weakens with age, for the experiment to be valid, it is important
that a groupto be tested for drug induced memory loss be compared with a
control group.
(A) to be tested for drug induced memory loss be compared with
(B) being tested for memory loss induced by drugs are compared with
(C) being tested for drug induced memory loss should be compared to
(D) being tested for drug induced memory loss are to be compared to
(E) that is to be tested for drug induced memory loss are to