Doug explained his "a" in biology as being the result of hard work and intelligence. he explained his "d" in chemistry as being the result of "bad teaching." this is an example of

i believe the answer is: Self-serving bias

Self serving bias refers to the type of thinking that being done solely for the purpose of maintaining our personal self-esteem. So when we are evaluating things that happen to us, the only explanation that we can come up with self-serving bias would always portray us in positive light.

nigger, that word was originated for white folks   to keep black people under

and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under

the correct answer is a