Which One of the Following Examples Most Clearly Illustrates the Effect

Which one of the following examples most clearly illustrates the effect of functional fixedness on problem solving?

A) Arnie is trying to solve a physics problem on a classroom test. He is so anxious that he can't recall the problem-solving strategies he needs.
B) Bradley is looking for something to haul water but doesn't have a bucket. He fails to realize that his plastic wastebasket could easily carry water.
C) Charlie is doing a series of addition problems. He overlooks the subtraction sign on the last problem and so adds when he should subtract.
D) Doug is angry that another boy stole his bicycle. Rather than report the theft to the police, he steals a bicycle from someone else.