M: Did you hear the thunder last night? W: Yes. I was awake at that time. It was really loud. M: I didn't see any lightning though. I thought thunder and lightning always occur together. W: What makes you believe that? M: A science book says, when lightning quickly beats the air, it will cause thunder. W: I guess you didn't read the whole article because the book also says if the lightning is very high in the sky, you might not see that., Question: What are the two speakers talking about? (A) Thunder and sound. (B) Thunder and lightning. (C) Thunder and science.
(B) Thunder and lightning.