Underextension in language occurs when a child incorrectly uses one word to describe other objects or actions that are similar to that word.

The statement describes overextension: a child uses a word too broadly for other objects or actions that seem similar. Underextension is the opposite—the child uses a word too narrowly, such as saying “ball” only for their own ball. So the statement is false, and choice B (F) is correct.

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