单选题

A They him only retired workers.

B They each do jobs they are good at.

C They close the hotel during low seasons.

D They employ as few workers as possible.

解析：
细节题。录音开头指出由于酒店的经营是有季节性的，所以两个合伙人经常“do a good deal of the work themselves”，并且“keep down the cost of extra staff”，即减少额外的雇员成本，由此可知D项正确。