Which of These Is the LEAST Convincing Piece of Evidence

Multiple Choice

Which of these is the LEAST convincing piece of evidence for the sensitive-period hypothesis related to language development?

A) Genie's language ability never fully developed.
B) Different neural mechanisms are used to process a second language by individuals who learned the second language in infancy and those who learned a second language after puberty.
C) The most proficient English speakers among immigrants to the United States were those who began learning English before age 7.
D) Adults are more likely than are children to experience permanent language impairment from brain damage.