The Fact That Overextensions Are More Common in Children's Production

The fact that overextensions are more common in children's production of words than in their comprehension of words implies that overextensions occur because

A) toddlers must rely on a very limited vocabulary to express themselves.
B) toddlers can't consistently identify objects to which different words apply.
C) children's vocabulary growth occurs at such a rapid pace.
D) toddlers cannot yet combine words into sentences.