M: I wish I hadn’t thrown away that reading list!
W: I thought you might regret it. That’s why I picked it up from the waste paper basket and left it on the desk.
Q: What do we learn from the conversation?（）

A．The man regrets being absent-minded．
B．The woman saved the man some trouble．
C．The man placed the reading list on a desk．
D．The woman emptied the waste paper basket．