Read the passage from a speech by President Barack Obama.

Mr. Secretary General; Your Excellencies, we are here because, right now, in crowded camps and cities around the world, there are families . . . who’ve endured years . . . as refugees, surviving on rations and aid, and who dream of someday, somehow, having a home of their own.

We’re here because, right now, there are young girls . . . who’ve suffered unspeakable abuse . . . who pray at night that someone might rescue them from their torment. . . .

We are here because, right now, there are mothers separated from their children—like the woman in a camp in Greece, who held on to her family photographs . . . and who said "my breath is my children . . . every day I am dying 10, 20, 30 times.”

Which rhetorical device does Obama use in this passage?

understatement
tricolon
anaphora
allusion