A、Tenth. B、Eleventh. C、Twelfth. D、Thirteenth. C由整个对话可知这是夫妻二人在商量带孩子到哪里去玩的问题。首先前两句确定了出去玩的时间是next Saturday，日期是twelfth，在男士说完日期后，女士没有

M: I want to take the children out next Saturday.
W: That’s eleventh, isn’t it?
M: No, it’s twelfth.
W: Where do you want to take them?
M: To the zoo.
W: I remember you took them there last month. They don’t like it.
M: Really? But that’s not what they told me.
W: I think the beach is a better place to go.
M: Okay, then, we can go to the beach.
W: I’ll get them ready for you in the morning.