Answer:
A The pact outlawed war. Within 11 years of its signing there was another world war.
Step-by-step explanation:
The Kellogg-Briand Pact a failure because "The pact outlawed war. Within 11 years of its signing, there was another world war."
This true because the Kellogg-Briand Pact was an agreement reached in 1928 of which purpose is to outlaw war in settling disputes among nations of the world. However, 11 years after, that is 1938, another war broke out known as World War II.
Therefore, this agreement failed to prevent the war which was intended to prevent.