I believe The answer is A.a class system
Answer: Badges
Explanation:
Just doin this for badges, good luck tho
Answer:
B. hindsight bias
Explanation:
Based on the scenario being described within the question it can be said that this fact best illustrates the power of hindsight bias. In the context of psychology this term explains the tendency that individuals have to overestimate their ability to predict an event that could not have been predicted, especially after it has already happened. Which in this case the class was most likely not surprised as they felt they knew what the Professor was going to say.