给出一道简单的英语语法题目，并解释正确的答案。

Which sentence is grammatically correct? A) She don't like pizza. B) He don't like pizza. C) They don't like pizza. D) I don't like pizza.
The correct sentence is D) I don't like pizza. This is because "don't" is the contraction of "do not" and is only used with the pronouns "I," "you," "we," and "they." With the pronoun "he," "she," or "it," the contraction used is "doesn't."