F: Hey, we should watch the kids more carefully when there in the pool. Did you ever hear about secondary drowning? ,M: No, never heard of it. Is that like when you get water up your nose? ,F: Don't joke about it! I learned it from the Internet. Some children die each year because they fall into a pool or a lake, but they didn't drown right away. Someone pulled them out of the water and they seemed OK for the first day. But a lot of water got into their lungs, and the next day, they died.
(A) M: I am afraid I did not quite catch what you were saying. Please repeat it. (B) M: So the secondary drowning is dying from water up one's nose. I got it. (C) M: Dying after seeming fine temporarily called secondary drowning, I understand it. (D) M: The secondary drowning is dying after seeming fine temporarily. Oh, I have heard of it.
C