One function is that they treat and prevent diseases
They also have the function of shutting down business in the case of a medical emergency
I’m pretty sure it is d, she is not thinking right
the company website because it's the most reliable and you'll actually get the facts
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.
I would say preschool age so c
