After fighting the fire for 12 hours, the firemen succeeded in putting it out.

A. The firemen managed in vain to put the fire out after a 12-hour fight.

B. Fighting the fire for 12 hours, the firemen were able to put it out.

C. The firemen wasted 12 hours putting the fire out.

D. Fighting the fire for 12 hours, the fire was put out.