Raisins are made by drying grapes

Answer choices

1. A

   Reinforces Surprise21% picked this

   Since grapes are bigger than raisins, it takes several bunches of grapes to provide the same amount of iron as

   This reinforces the fact that raisins are more iron-rich than grapes (you'd only need a handful of raisins to get the same iron you'd get out of eating several bunches of grapes). But it doesn't explain why raisins are more iron-rich than grapes.

   21%
2. B

   Correct66% picked this

   Caramelized sugar cannot be digested, so its calories do not count toward the calorie

   Why this is right

   This is offering us a story of how a grape sheds calories en route to being a raisin. The grape had 20mg of iron and 10 calories. 2 mg iron per calorie The raisin keeps that 20mg of iron. "The only thing removed from the grapes is water". But the sugar in the grape caramelizes as it becomes a raisin. And when we measure how many calories something has, we don't count calories in caramelized sugar (because the body can't digest it). So when we measure the raisin that formed from that 10 calorie grape, we get a number lower than 10. Some of the grape's 10 calories were from sugar. When that sugar caramelized, then those sugar-calories stop being counted. If there were 3 calories from the sugar, then now that the grape has caramelized into a raisin, that 10 calorie grape will only be a 7 calorie raisin. And if the raisin has 20mg of iron and is only 7 calories, then it's close to being 3 mg iron per capita. So this answer allows us to explain why a raisin made from a given grape can have more iron per calorie than the grape, even though no iron is added and only water is removed.

   Skill tested: Paradox · how this choice captures the argument's function is the move to repeat next time.

   66%
3. C

   Out of Scope: rate of absorption8% picked this

   The body can absorb iron and other nutrients more quickly from grapes than from raisins because of the relatively

   We're trying to explain why a raisin has more iron per calorie than the grape it formed from. The paradox is only about the chemistry of the grape/raisin. It has nothing to do with organisms that consume grapes or raisins. So it's irrelevant how a grape or raisin interacts with a human body.

   8%
4. D

   Reinforces Surprise1% picked this

   Raisins, but not grapes, are available year-round, so many people get a greater share of their yearly iron intake

   This reinforces the fact that raisins are more iron-rich than grapes (people get more of their yearly iron from raisins than from grapes). But it doesn't explain why raisins are more iron-rich than grapes.

   1%
5. E

   Out of Scope: accompanying foods4% picked this

   Raisins are often eaten in combination with other iron-containing foods, while grapes are usually

   We're trying to explain why a raisin has more iron per calorie than the grape from which it was formed. The paradox is only about the chemistry of the grape/raisin. It has nothing to do with any other foods you might later mix with raisins or grapes. This answer feels like a correct answer, because it feels like we're offering an alternate explanation for why raisins seem to have more iron than grapes. ("It's not because raisins are inherently more iron-heavy, it's just that they're eaten with other foods that supply iron.") But we are accepting as a given the fact that raising are more iron-heavy than grapes. We need to explain why they are so.

   4%