[单项选择]

Conversation 2
[听力原文] 8-10
M: How much are the carnations and the roses
W: One dollar for each carnation and (9)one and a half for each red rose.
M: (9)Then I’d like a dozen red carnations and half a dozen red roses.
W: I bet it’s for your mother, (8)as it’s Mother’s Day today.
M: Well, not completely true. (8)It happens to be her birthday.
W: Oh, really I guess she must be very happy to receive these beautiful carnations from you.
M: Yeah, she will. She really likes flowers. So I buy her some every year. I’d just wish they would stay fresh longer than they do.
W: (10)Put a little sugar and vitamin C in the water. They’ll stay fresh for days.
M: Really I’ll tell my mother. And thanks for your suggestion.
W: That’s all right. Happy birthday to your mother!

What does the woman suggest the man put in the water（）
A. Sugar.
B. Both A and
C. C. VitaminC.
D. Salt.