Which Statement Is the BEST Evidence of a Sensitive Period

Multiple Choice

Which statement is the BEST evidence of a sensitive period for language development?

A) Deaf adults who learned ASL as their native language are more proficient than those who learned ASL as a second language.
B) Genie eventually learned to comprehend and speak English after intensive training.
C) Adults are more likely than children to suffer permanent language impairment from brain damage.
D) The length of time Chinese and Korean immigrants had been in the United States was more strongly associated with their English proficiency than was the age at which they had come to the United States.