What did the washington naval conference, the nine power treaty, and kellogg-brains pact have in common

The Washington Naval Conference was a Conference that gathered the world’s largest naval powers. The main objective of the Conference was to discuss the naval disarmament and ways to relieve the tensions in East Asia.The Nine-Power Treaty was a treaty that was signed in the Conference, it internationalized the US Open Door policy in China. All countries that signed it would respect the integrity of the territory of China. The Kellogg-Briand Pact was a multilateral agreement that attempted to eliminate war as an instrument of national policy.

All of those have in common the aspect of a multilateral agreement between countries that attempts to avoid war and also protect other countries sovereignty.

The answer to the question is a.