Which of These Statements Concerning Language Acquisition Is True

Multiple Choice

Which of these statements concerning language acquisition is true?

A) Humans must be exposed to speech before a certain age to learn complex features of language.
B) Humans can learn to speak foreign languages as well as native speakers at any time in their lives as long as they study hard.
C) Language acquisition is entirely under genetic control.
D) There is tremendous variation in the sequence of human language development.