【正确答案】 C

【答案解析】[解析] 推理判断题。从第一段第二、三句“Some guests are prepared to eat while others are looking around with nervous glances．Which knives and forks should be used first，and where should you put the napkin?”可判断对于餐桌礼仪不熟悉的客人在晚宴上会感到没把握该怎么做。所以[C]为正确答案。