As Children Move Beyond Two-Word Utterances, They Begin Using Plural

Multiple Choice

As children move beyond two-word utterances, they begin using plural and possessive nouns, appropriate verb endings, prepositions, articles, and various forms of the verb "to be." This is evidence that the children

A) are increasing their vocabulary.
B) have well-established phonology.
C) know morphological rules.
D) know pragmatic rules.