Which One of the Following Examples Most Clearly Illustrates the Effect

Multiple Choice

Which one of the following examples most clearly illustrates the effect of mental set on problem solving?

A) Albert is trying to solve a physics problem on a class exam. He is so anxious that he can't remember how to do the problem.
B) Bradley can't find the right size of test tube to complete a chemistry lab.
C) Charlie has just completed six math problems requiring addition. When he turns to the next problem,he overlooks the subtraction sign and so he adds instead of subtracting.
D) Doug is angry that another boy stole his bicycle,and so he steals a bicycle from someone else.