单选题 Everyone has faced the embarrassing______of deciding how much extra to give a waiter or taxi-driver.
【正确答案】 C
【答案解析】解析：本题测试句意和名词辨析。incident“事情，事件”；event“事件”；dilemma“左右为难的处境”；menace“威胁，胁迫”。故答案为C。