. . . . . . . . apples I bought are sour. A. a B. an C. the D. no article

The correct answer is: no article.

The word “apple” is a common noun, which means it refers to any apple. In this sentence, we are not referring to a specific apple, but to all of the apples that the speaker bought. Therefore, we do not need to use an article.

If we were referring to a specific apple, we would use an article. For example, if we were talking about the apple that the speaker bought first, we would say “The apple I bought first is sour.”

We would also use an article if we were talking about a type of apple. For example, if

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