Overextensions Are More Common in Children's Production of Words Than

Overextensions are more common in children's production of words than in their comprehension of words.What does this imply about the use of overextensions

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