Which of the Following Is True of Second Language Learning

Which of the following is true of second language learning?

A) the ability to acquire language is strongest in childhood
B) bilingual children seem to have an advantage over unilingual children in learning a new language
C) it is particularly difficult to learn words which appear to be similar to words in the first language
D) second language learning is qualitatively different from first language acquisition
E) in adults the neurophysiological mechanisms involved in the production of sounds are generally no longer plastic enough to adapt to the requirements of a new accent