How Does the Phenomenon of Self-Fulfilling Prophecy Relate to Intergroup

How does the phenomenon of self-fulfilling prophecy relate to intergroup competition?

A) The less we present ourselves as competitive, the more competitive the outgroup becomes, which at the end increases intergroup hostility.
B) As people view others as competitors, they themselves begin to compete, which increases the intergroup hostility.
C) As people view others as competitors, they begin to compete less, thus decreasing the intergroup hostility.
D) As people compete with others, they learn more facts about them, which reduces intergroup hostility.