Read the last paragraph of "Among Free Men."

"Among free men," said Abraham Lincoln, "there can be no successful appeal from the ballot to the bullet; and those who take such appeal are sure to lose their cause and pay the costs."

Which rhetorical device does Lincoln use?

alliteration, in the phrase "ballot to the bullet"
antithesis, in suggesting one could both "lose" and "pay"
metonymy, in the use of "ballot" to represent voting
allusion, in the reference to "free men"