What language . . . . . . . .? A. do you speak B. you speak C. you are speaking D. speak you

The correct answer is A. do you speak.

The other options are incorrect because they do not follow the correct grammar structure for a question. Option B, you speak, is a statement, not a question. Option C, you are speaking, is a present progressive tense sentence, which is not the correct tense for a question. Option D, speak you, is not a grammatically correct sentence.

The correct answer, A. do you speak, is a question in the present tense. It is the most common way to ask someone what language they speak.