单选题

A They complained about the conditions in the hotel.

B They took a taxi and went sightseeing in the town.

C They went out for dinner and spent the rest of the night in a club.

D They were so tired that they took a bath and went to bed immediately.

解析：
对话中女士说她和丈夫到达旅馆后已经相当晚了，所以就叫了一个出租车，去吃了晚饭，然后就“went to a nightclub and stayed there until the early hours”，由此可知C项正确。