After world war i, what action did the international community take in response to the new weapons of warfare?

trench warfare was banned.
atomic warfare was banned.
chemical warfare was banned.
unrestricted submarine warfare was banned.

After World War I, chemical warfare was banned by the Geneva Protocol in 1925.

It was signed in Geneva on June 17, 1925 and entered into force on February 8, 1928. It was registered in the Treaty Series of the United Nations League on September 7, 1929.

It prohibits the use of chemical weapons and biological weapons, but says nothing about the production, storage or transfer of them. Later, other treaties covered these aspects (the Convention on Biological Weapons in 1972 and the Chemical Weapons Convention in 1992).

answer; ///the correct answer is,by introducing a merit system of nobility.

false

explanation: