Lori, a Person with Whom You Are Not Friends, Volunteers

Lori, a person with whom you are not friends, volunteers at the local hospital. You assume that she is volunteering so that she will look good on her college applications. However, when your best friend adamantly refuses to volunteer his time, you assume it is because he is so busy with all of the other activities in his life. Which of the following attributional errors does this situation illustrate?

A) Actor-observer effect
B) Ultimate attribution error
C) Unrealistic optimism
D) Fundamental attribution error