Which of These Situations Involve(s) Contact That Is Likely to Reduce

Which of these situations involve(s) contact that is likely to reduce prejudice and discrimination?

A) Several African-Canadian servers begin working at a restaurant in an overwhelmingly White neighbourhood.
B) A White adult lives in his African-Canadian partner's hometown. He and his partner live a few miles . from the neighbourhood in which the partner's parents and siblings live.
C) Jasmine, an African Canadian, has a new boss, a White woman.
D) all of these options