Read the following excerpt carefully before choosing your answer. This passage is from then-Senator Barack Obama's November 2007 Speech on the "American Dream"

"When our fellow Americans are denied the American dream, our own dreams are diminished. And today, the cost of that dream is rising faster than ever before. While some have prospered beyond imagination in this global economy, middle-class Americans—as well as those working hard to become middle class—are seeing the American dream slip further and further away.

You know it from your own lives. Americans are working harder for less and paying more for health care and college. For most folks, one income isn't enough to raise a family and send your kids to college. Sometimes, two incomes aren't enough. It's harder to save. It's harder to retire. You're doing your part, you're meeting your responsibilities, but it always seems like you're treading water or falling behind. And as I see this every day on the campaign trail, I'm reminded of how unlikely it is that the dreams of my family could be realized today…"

Which type of rhetorical device is used in the lines, "It's harder to save. It's harder to retire"?

Allusion
Hyperbole
Anaphora
Juxtaposition