Concept:The passage warns that relying too much on AI can hurt students' ability to think for themselves.Explanation:The passage directly states that over-dependence on AI may limit critical thinking.If students always turn to machines for answers, they risk losing problem-solving skills.This means their thinking skills become weak.The other options—higher costs, fewer classrooms, and better results—are not presented as risks in the passage.Therefore, the risk identified is poor thinking skills.Answer:C. Poor thinking skills