I believe there are no prepositions in this sentence, here is an example of a few prepositional words:
about
below
excepting
off
toward
above
beneath
for
on
under
across
beside(s)
from
onto
underneath
after
between
in
out
until
against
beyond
in front of
outside
up
along
but
inside
over
upon
among
by
in spite of
past
up to
around
concerning
instead of
regarding
with
at
despite
into
since
within
because of
down
like
through
without
before
during
near
throughout
with regard to
behind
except
of
c) hyperbole
A hyperbole is an over-exaggeration. In this phrase, it is highly unlikely that the little city in Georgia has been sleeping for "forty thousand years" especially considering that the United States is only 242 years old. If personification were an option, it would also be a great choice. Personification is giving non-human thing human-like traits. In this phrase, the city (non-human) is being given a human trait (dozing).
The other options: an allusion is a reference to another piece of literature or other published work. A flashback is an interruption that tells about something that has already happened. Rhyme is a group of words that sound similar (bone, cone, phone).
