Which of the Following Is a Typical Example of the Actor/observer

Which of the following is a typical example of the actor/observer difference?

A) John's roommate fails a test and John tells him that he'll do better next time while secretly thinking,"What a loser."
B) Terry's roommate forgets to pay the phone bill and blames it on her stress over her romantic breakup,while Terry blames it on how irresponsible her roommate is.
C) Molly's sister Kelly trips and falls during a dance performance; Kelly thinks,"I'm such a klutz" while Molly thinks,"She must have tripped on the hem of her dress."
D) Susan's brother Sam misses the last touchdown during a football game,causing his team to lose; Susan thinks,"He must be upset about that," and Sam thinks,"Everyone's going to be mad at me."