单项选择题

M: Hi, Kate. Can I discuss our class picnic with you
W: Sure. Go ahead.
M: Today I think we must decide where and when to have our class activities of having a picnic. Many classmates are asking me about that.
W: Ok, first, about the location. How about the Central Park It is near our campus, and we can just walk there, That saves some time and money.
M: Sounds good. Do you think we can go on Saturday
W: Maybe not. Some classmates must attend the training program of our department. Sunday is better.
W: Ok. Then I will go to inform the class.

When are they going to have the picnic().

A.On weekdays.
B.On weekends.
C.On Saturday.
D.On Sunday.