Answer:
The answer to the question: ¿Dónde te vistes? is:
d. Me visto en la cabina.
Explanation:
In a conversation, <em>when somebody asks about you, the answer must have the personal noun "I",</em> that's is the case of the question, where is discarded the option C because refers to "you".
The other options are eliminated because: the question is <u>where</u> but the A option is <em>in the pool</em>, a place where you can't dress and the option B says <em>at seven</em>, but that's an hour, not a place, by that reason is out too.
