Let’s have . . . . . . . . good breakfast and start the day. A. a B. an C. the D. no article

The correct answer is D, no article.

A, B, and C are all articles, and articles are used to introduce a noun. In this sentence, the noun is “breakfast.” However, we do not need an article here because “breakfast” is a general noun. We are not talking about a specific breakfast, just breakfast in general.

Without an article, the sentence sounds more natural and conversational. It also sounds more inclusive, as it does not imply that there is only one “right” way to have breakfast.