Which of the Following Is a Likely Explanation for the Dramatic

Which of the following is a likely explanation for the dramatic increase in vocabulary acquisition that occurs in toddlerhood?

A) Adults of toddlers intensify their efforts to teach word meanings.
B) Toddlers demonstrate increasing abilities to use social cues to infer a speaker's intentions.
C) Toddlers are more persistent than younger children in their efforts to communicate their needs.
D) Toddlers are focused on language learning whereas younger children are focused on motor development.