Which follow-up question best demonstrates attention to the topic and point of view of the speaker?

The complete question is:

Read the scenario about a formal discussion.

Mrs. park’s biology class is discussing the components of healthy garden soil. one student mentions that her community garden has a compost pile and that members of the garden can use the compost for free. she says that she uses the compost now and has found it to be much more effective than fertilizers sold at the store. which follow-up question best demonstrates attention to the topic and point of view of the speaker?

a: how have you been able to gain so much important knowledge about gardening?

b: what kinds of things do garden members find are beneficial to compost?

c: what differences have you noticed about your garden since switching to compost?

d: why would you use compost in a garden when fertilizer is inexpensive and easy to use?

c: what differences have you noticed about your garden since switching to compost?

Explanation:

In the given excerpt the topic of discussion was how use of compost was better than the fertiliser being sold in at the store.

It was stated that the compost was free for everyone to use. So cost wise it will be a better option than fertiliser. Clearly the speaker is in support of compost use over fertiliser.

A follow up question that shows attention and supports the point of view of the speaker is: What differences have you noticed about your garden since switching to compost?

This prompts the speaker to expantiate on the what makes compost a better option for gardening

C) What differences have you noticed about your garden since switching to compost?