Answer:
The right answer is, B. Te despiertas.
* ¿ A qué hora te despiertas tú?
Step-by-step explanation:
Because it is a question that is being asked in the first person to someone else, therefore we must analyze the context of the grammatical person, the number, the gender and the time, thus we will be able to identify the logical form of the verb conjugation so that it has concordance with what you want to express.