Which of the Following Is NOT True of the Preschoolers

Which of the following is NOT true of the preschoolers' language development?

A) During the preschool years, there is a language explosion, with words and sentences bursting forth.
B) Young children's word placement matches the grammatical structure of their native language from the time they first string two words together.
C) Young children have difficulty demonstrating an understanding of verb tense in their language.
D) Preschool children are extraordinarily adept at producing socially adaptive behavior in their verbal communication.