With the change of red lights, there are long queues of vehicles that wait while a few people who walk across the zebra.

A．wait... walk

B．waiting... walking

C．waiting... walk

D．wait... walking

当事人在保证合同中约定，债务人不能履行债务时，由保证人承担责任的保证是( )。

A．一般保证

B．连带责任保证

C．法定保证

D．委托保证