For this case, we can translate the given sentence as:
What time do you guys sleep? _______ at 8.
The options are:
A. I go to bed
B. They go to bed
C. You go to bed
D. We go to bed
The correct option is D. First person plural. "We go to bed" or "Nos acostamos"
Answer:
¿A qué hora se acuestan ustedes? Nos acostamos a las 8.