Answer:
Both sides agree to give up something to solve a conflict.
Explanation:
The word "compromise" is used to refer to the 'agreement ground', the 'middle ground' of an agreement between the parties involved. It also requires a certain level of sacrifice on both sides of the party to come to a mutual agreement.
As used in the given sentence, 'compromise' means the agreement of both sides to give up something so that the conflict is resolved. This can be understood from the line "neither side was completely satisfied, but each got part of what it wanted." This means that both sides had to make sacrifices to get to an agreement with each other.
Thus, the correct answer is the fourth or last option.