💡 Detailed Explanation
The correct answer is '和解' (wakai), which means reconciliation or settlement, often used for ending a dispute or conflict. '解決' (kaiketsu) means to solve a problem, but '和解を結ぶ' is a more specific and natural collocation for countries making peace. '妥協' (dakyō) is a compromise, and '解放' (kaihō) means liberation or release, which don't fit the context.