“公车上书”揭开了维新变法运动的序幕，其导火线是哪个条约的签订？

A．《南京条约》

B．《北京条约》

C．《马关条约》

D．《辛丑条约》

A．To call the community to donate more money after emergency takes place.

B．To provide financial help after the emergency takes place.

C．To be ready with emergent financial crisis.

D．To be ready for the financial needs of the community.