Violence Between Ethnic Groups Is Not Inevitable, but the Idea

Violence between ethnic groups is not inevitable, but the idea that it is persists. Which of the following is not a reason for its persistence?

A) It offers a tidy narrative that seems to explain the world.
B) Mass media repeat the idea regularly.
C) Ethnic leaders promote the idea to gain power.
D) Ethnic groups actually do fight with each other all the time.