635. Several recent studies suggest that a child born into a family whose members have allergies will probably themselves develop allergies following the onset of a minor viral infection.

(A) a child born into a family whose members have allergies will probably themselves develop allergies
(B) children born into families whose members have allergies will probably themselves develop allergies
(C) a child born into a family the members of which have allergies will probably develop an allergy
(D) in those families where members have allergies, children will probably develop allergies themselves
(E) children born into a family in which there are allergies will themselves probably develop an allergy

Solution:

Idioms + Subject-verb Agreement + Pronoun

In A, subject-verb agreement is violated. “a child…will themselves develop…”
In C, “whose” must be preferred over “of which”.
D is wordy. “where” used after “families” is incorrect. “where” refers to place.
In E, “whose” must be preferred over “in which”.
In B, “families whose members” is correct and hence, B is the best choice.

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