[問題] 第二題很舊的GRE Analysis Q (題型是CR)

[vantreal]

Children born blind of deaf and blind begin social similing on roughly the same schedule as most children, by about three months of age.

The information above provides evidence to support which of the following hypotheses?

(A) For babies, the survival advantage of smiling consists in bonding the caregiver to the infant.

(B) Babies do not smile when no one else is present. (irrelevant)

(C) The smiling response depends on an inborn trait determining a certain pattern of development.

(D) Smiling between persons basically signals a mutual lack of aggressive intent. (irrelevant)

(E) When a baby begins smiling, its caregivers begin responding to it as they would to a person in conversation.

why (C)?