Which of the Following Statements About Infants' Early Word Production

Which of the following statements about infants' early word production is NOT true?

A) The proportion of nouns in very young children's vocabulary is related to the proportion of nouns in their mothers' speech to them.
B) The rate of vocabulary development is associated with the amount of speech infants hear.
C) One-word utterances typically have the same meaning as adults' single words.
D) Highly educated mothers have children with larger vocabularies than those of children of less-educated mothers.