The answer out of those is defiently C!!! FYI you should probally stay away from anyone offering u any kind of drug! :)
It is D, sharing appreciation for what is being said. Both A and B aren't crucial to being a good listener, in fact in practice they effectively draw attention to yourself, which would be fine if the question was regarding being a good conversationalist. Additionally, C is just completely irrelevant, that wouldn't even be a good conversation practice, let alone a trait important to listening.
Answer:
The pancreas produces the hormone insulin that is responsible for carrying sugar from my body to the cells for use. It has been shown that obese people will have a high incidence of diabetes, therefore it is advisable to lose weight and have a proper diet.