--- Mum, could I play with my classmates for a while after I finish my homework?

--- _______. But you must come back before supper.

A．Yes, you can

B．Yes, you could

C．No, you can’t

D．No, you couldn’t

某业主和承包商签订了施工合同甲，承包商和分包商签订了分包合同乙。为保证施工合同甲的认真履行，业主要求承包商提供保证人，则保证合同丙的当事人是( )。

A．承包商和分包商

B．承包商和保证人

C．业主和保证人

D．业主和承包商