I'll give you a question, please answer with step-by-step reasoning process.
Because it was only two bedroom, one of the three roommates slept on the couch in the where?\nOptions:\n- rest area\n- party\n- bathroom\n- waiting room\n- apartment

apartment
Apartment is one living space in a large building.

Apartments usually are small with only one or two bedrooms.

.

Final answer: apartment