The old __. 

A．have to take good care of

B．was looked after very well

C．have to be taken good care of

D．were had to look after very well

筑路队原计划每天筑路720米，实际每天比原计划多筑路80米，这样在规定完成全路修筑任务的前3天，就只剩下1160米未筑。问这条路全长多少米( )

A．13160

B．10160

C．12160

D．11160