1. 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（B）

(E) children born into a family in which there are allergies will themselves probably develop an allergy

B中的themselves 感觉可以指代前面的children, families and members. 难道这里不存在指代不清的问题么? 另外D错在哪?是families where不对么? 求教,谢谢!

B中的themselves 指代非常明确，就是children, 因为后面的谓语develop对应的主语就是children.