Concept:Response set is a cognitive bias that makes a person rely on a previously successful strategy, even when it is not suitable for the current problem.
Explanation:Problem solving requires flexible thinking.
Response set hinders this by limiting the ability to consider new or better approaches.
In contrast, metacognitive abilities help monitor and regulate thinking, which supports problem solving.
Studying worked examples shows expert strategies and improves learning.
Brainstorming and peer discussion bring fresh ideas and different perspectives.
Therefore, only response set acts as a barrier to effective problem solving.
Answer:Option B – Response set