【正确答案】 B

【答案解析】[听力原文]
   W: Henry, where did these silver forks come from? They don't look like anything we own.
   M: I forgot to mention that. I didn't mean to steal them. Remember how we ordered room service from the hotel on our last night in Vancouver? We were running late that next morning—I must have accidentally packed them. What do you think we should do?
   W: This is so embarrassing. Let's put them in an envelope and send them back anonymously.
   M: Well, let's wait until we see the final bill from the hotel. I'd hate to be charged for them if the maid reports them missing.
选项A错误。选项B正确，男士称他忘记告诉女士，这意味着他在对话前就知道叉子的事。选项C和D对话中均未提及。