Research on the Learning of a Second Language Suggests That

Research on the learning of a second language suggests that:

A) neuropsychological plasticity is essential for second language acquisition
B) beyond a certain age, it is difficult to acquire a second language and speak it without an accent
C) young children find it easier to learn a second language than adults because of neuropsychological plasticity
D) the more languages one speaks, the easier it is to learn another one
E) both a and b