The correct answer is D. no article.
French is a language, and languages are not typically preceded by articles. In fact, using an article with a language can sound strange or even incorrect. For example, it would be odd to say “I speak a French” or “I am learning an English.”
There are a few exceptions to this rule. For example, if you are referring to a specific language course or program, you might use an article. For example, you could say “I am taking a French class” or “I am learning Spanish
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