A．Forty-five women were killed in the blaze at a drug treatment center.

B．The fire was not caused by arson according to a senior firefighter.

C．Nine mentally ill patients died in the fire.

D．People were trapped behind locked gates and barred windows.

当事人不履行金钱债务时，必须( )。

A．采取补救措施

B．双倍支付定金

C．支付违约金

D．继续履行