Two litigants in a case can agree to a settlement anytime before the verdict. Option C is correct.
A litigant is understood as a person who is involved in a civil legal case, or a lawsuit, either because they are making a formal complaint regarding someone, or because someone is making a complaint about them. So, tu put it simply, both the person who sues and the person who gets sued are both litigants.
Two litigants in a case can reach an agreement to settle a matter in question before the Court pronounces the verdict (the correct option is "C"). This agreement is known as an out-of-court settlement which is a compromise between both parts with the purpose of solving the litigation of a previously existing claim.