Final answer:
The subject is Spanish and the correct answer is C. vienes.
Step-by-step explanation:
The subject of this question is Spanish because it is asking about coming to class in the future tense. In Spanish, the subject pronouns change depending on the speaker. The correct answer is C. vienes because it matches with the pronoun tú which means 'you' in English. The verb 'venir' means 'to come'.
Learn more about Spanish verbs