The Language Errors of 2- to 3-Year-Old Children Reveal That

The language errors of 2- to 3-year-old children reveal that the children

A) do not yet understand the meanings of the words they say.
B) seem to be applying grammatical rules, even when exceptions should apply.
C) speak mostly by imitation and rarely make a new sentence they have not heard someone else say.
D) learn to use the passive voice before they can use the active voice correctly.