单项选择题
M: How much are the carnations and the roses
W: One dollar for each carnation and one and a half for each red rose.
M: Then I’d like a dozen red carnations and half a dozen red roses.
W: I bet it’s for your mother, as it’s Mother’s Day today.
M: Well, not completely true. 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: Put a little sugar and vitamin C in the water. They’ll stay flesh for days.
M: Really I’ll tell my mother. And thanks for your suggestion.
W: That’s all fight. Happy birthday to your mother!
A. Sugar.
B. Both A and C.
C. Vitamin C.
D. Salt.