How does the narrator’s use of alliteration in this phrase from paragraph 3 affect the passage?

…which doesn't inspire copious amounts of confidence.

it gives the reader a sense of how unsteady the diving platform is.

it makes clear to the reader that the narrator is making an ironic understatement.

it makes clear to the reader that the narrator is not actually nervous.

it the reader imagine the ease and assurance felt by other divers.

the answer is it makes clear to the reader that the narrator is making an ironic understatement.