Which sentence states an important theme of “kubla khan”?
a. nature has supernatural powers.
b. there is a powerful contrast between sun and ice.
c. human beings need pleasure.
d. music calms the savage beast.

a. Nature has supernatural powers.

Explanation:

The connection among man and nature is a noteworthy topic for Coleridge. It's painted all over "Kubla Khan," as we go from the vault to the stream, and afterward from the greenery enclosures to the ocean.

Once in a while he's centered around human characters, now and then on characteristic powers. Indeed, it's hard to make tracks in an opposite direction from this topic in this ballad. Think about this pressure as a pull of war among people and their brief developments (buildings) and the appearing perpetual quality of nature.