Which Statement Is True for Bilingual Children Versus Monolingual Children

Which statement is true for bilingual children versus monolingual children?

A) Bilingual children have a smaller vocabulary in each language than their monolingual peers.
B) Bilingual children have a larger vocabulary in each language than their monolingual peers.
C) Monolingual children are better at mathematics than bilingual children.
D) There are no differences in the academic abilities of bilingual and monolingual children.