A、Two B、Three. C、Six. D、Seven. D题目问有多少人被困在火灾中。对话中提到被困的有一对夫妇，两位女士以及三个儿童，共计7人。故选D。

W：Have you heard about the big fire last night?
M：Yeah, is it true that everyone survived?
W：Yes. There was a couple on the second floor and two women and three kids on the ground floor. But no one was badly hurt.A miracle, isn’t it?
M：It is indeed.
Q：How many people were caught in the fire?