Researchers Have Learned That

Multiple Choice

Researchers have learned that

A) all children learn to understand about 75 words by the time they're 13 months old.
B) all children learn to say about 500 words by the time they're 13 months old.
C) the ability of children to learn language differs more between cultures than it does within any one culture.
D) there is great individual variation among children in the learning of language.