Answer:B. White privilege
Step-by-step explanation:
White privilege refers to privileges that are received by white people just based on their skin color whilst the people who are non whites living under the same society , political and economical system don't get the same privileges.
It dates back to racism and bias ideas concerning which race is more important than the other.
It can be the fact that the police officer looked at Alexander being white and thought based on a stereotype that he hasn't done this before or he doesn't usually do this unless he has a reason however he may feel that Christopher probably do this all the time, advantages of being white for Alexander worked on his favour.