Satire can best be defined as the literary form or technique in which humor and are used to criticize one's vices.

impartial means: treating all rivals or disputants equally; fair and just.

i would say that impartial is agreeing with something, because impartial means to treat your rivals, arguments, and reasoning equally and fair. so if you rival says something, agreeing on it means you did the impartial.

i am also pretty sure it is c

the flighty purpose never is o'ertook / unless the deed go with it"