The old man has much ________ in traditional Chinese medicine. [ ] A. belief B. thought C. idea D.

The old man has much ________ in traditional Chinese medicine. [ ] A. belief B. thought C. idea D. relief

The correct answer is A. belief.

Explanation:

belief (n.): refers to a strong feeling that something is true or real, often involving trust or faith in an idea, system, or person. The phrase “have belief in” means to trust or have faith in something.

thought (n.): usually refers to the process of thinking, an idea, or an opinion. We say “have thoughts about” rather than “have much thought in.”

idea (n.): a concept or suggestion. We say “have an idea of/about” something.

relief (n.): a feeling of reassurance or relaxation, not fitting this context.

The sentence means “The old man has a lot of faith/trust in traditional Chinese medicine.”
So “have much belief in” is the correct collocation.