Read the excerpt below and answer the question.

and from this chasm, with ceaseless turmoil seething,

as if this earth in fast thick pants were breathing,

a mighty fountain momently was forced:

20 amid whose swift half-intermitted burst

huge fragments vaulted like rebounding hail,

or chaffy grain beneath the thresher's flail:

and 'mid these dancing rocks at once and ever

it flung up momently the sacred river. ("kubla khan," lines 17-24)

the rhythm in the excerpted lines of coleridge's poem can be compared to

1)heavy breathing

2)pounding water

3)sharp gunshots

4)rolling thunder