【单选题】

M: I just received anE-mail from one of my former classmates. I was surpriseD、I hadn’t heard from him for ages.

W: Well, I’ve been out of touch with most of my old friends, only one or two still drop me a line occasionally.
Q: What does the woman mean
A、Only true friendship can last long.
B、Letter writing is going out of style.
C、She keeps in regular touch with her classmates.
D、She has lost contact with most of her old friends.