单选题

A The back pocket of his tight trousers.

B The top pocket of his jacket.

C A side pocket of his jacket.

D A side pocket of his trousers.

解析：
细节题。录音中指出“For man, one of the best ... is the back pocket of tight trousers”，即对于男子来说，放置钱包最好的地方是紧身裤子的后口袋，故A项正确。