And ain't i a woman?
i could work as much
and eat as much as a man--
when i could get to it--
and bear the lash as well
and ain't i a woman?

what is the main purpose of the use of repetition in these lines?

it forces the audience to examine their ideas about african american women.
it shocks the audience by describing the treatment african american slaves.
it reassures the audience that the speaker has experienced the things she describes.
it shows the audience that the speaker is a supporter of popular social causes of the time.