Is the driver downshifts to drag us over the hill a hyperbole, alliteration, or personification?

The driver
downshifts to drag us over the
hill.

The quick repetition of the d sound in this
sentence is a great example of . (And it works effectively in this
example because it helps create the hard d-d-d sound of a car or motor.) Alliteration relies on
the repetition of a consonant sound (typically at the beginnings of words, though sometimes that
extends to other placements within words) within a sentence or line of poetry.

is the attribution of human characteristics to something
that is not human. Since the driver is human and ultimately drags "us" over the hill
with his car, that's not an example of personification.

A
is an exaggeration. While "drags" is a great verb
choice, more interesting than, say, drives, it isn't really an exaggeration. A hyperbole would
look more like this:

The driver downshifted to drag us
over the hill going a million miles an hour.

Since he
couldn't possibly drive "a million miles an hour," this would be a clear exaggeration
and a hyperbole.