Pedro and Juan Are Identical Twins Living in the Same

Multiple Choice

Pedro and Juan are identical twins living in the same crowded orphanage, where they receive little attention from the caregivers. Pedro is adopted at age six and Juan not until age thirteen. Pedro is able to catch up with his peers in terms of language development; Juan is not. In contrast to Juan, Pedro was adopted before the ____.

A) plasticity plateau
B) critical verbal stage
C) sensitive period
D) acquisition phase