The answer to this question is counterclaim
In legal context, counterclaim refers to a claim that is made to rebut a previus claim that made aginst ourselves.
Counterclaims usually made if the defendant feel that he/she has a strong reason that the actions that he/she made is the result of actions by the suer.
B, have been stagnant in their numbers.
It gives courts the authority to hold trials and determine the facts of cases.
The answer is c I hope this helps