Right answer:
arreglas
Arreglas is the conjugation of the verb arreglar for the second person singular in the simple present. So this question is given using the reflexive pronoun te. In Spanish, we use Reflexive Pronouns with a verb to point out that a person carries out an action to or for himself or herself. Therefore, you are carrying out an action for yourself. Finally:
¿Te arreglas en el baño?