Evidence That Children Develop an Underlying System of Rules for Grammar

Multiple Choice

Evidence that children develop an underlying system of rules for grammar is:

A) demonstrated by their use of noun - verb phrases in two word utterances.
B) found in their rote memory of multiword utterances.
C) seen in use of word combinations, errors made in applying rules and in experiments on using new word combinations.
D) indicated by the variety of word combinations they use.