Self-study
Raisins are made by drying grapes in the sun. ████████ ████ ██ ███ █████ ██ ███ ██████ ██ ███████████ ██ ███ ████████ ███████ ██ ██████ █████████ ███ ████ █████ ███████ ████ ███ ██████ ██ ███ █████ ████ ██████████ ██████ ███ ███████ ███ █████ ████████ ██ ████████ ██ ██████████ ███ ████ ████ ███████ ███████ ████ ████ ███ ███████ ████ ██████ ██ ██ ████ █████████
"Surprising" Phenomenon
When grapes are dried into raisins, the only changes they experience in their contents are sugar caramelization and water loss. So why do raisins have more iron per calorie than grapes do?
Objective
The correct answer will have to explain how raisins can have a higher iron-to-calories balance than grapes, despite seemingly having no iron added nor calories removed. The explanation may indicate that raisins are lower-calorie than grapes, or perhaps that the drying process somehow results in a higher iron content.
9.
Which one of the following, ██ █████ ████ █████ ██ ███████ ███ ███████ ███████ ████ ████ ███ ███████ ████ ██ ███████
a
Since grapes are ██████ ████ ████████ ██ █████ ███████ ███████ ██ ██████ ██ ███████ ███ ████ ██████ ██ ████ ██ █ ███████ ██ ███████ █████
We're not concerned with the relative size of raisins versus grapes, but with the balance between iron and calories. This doesn't give us any useful new information.
b
Caramelized sugar cannot ██ █████████ ██ ███ ████████ ██ ███ █████ ██████ ███ ███████ ███████ ██ ████████
If less of the sugar in raisins contributes calories, then raisins are effectively lower-calorie than grapes. The two have the same amount of iron, so this would explain why raisins have more iron per calorie than do grapes.
c
The body can ██████ ████ ███ █████ █████████ ████ ███████ ████ ██████ ████ ████ ███████ ███████ ██ ███ ██████████ ████ █████ ███████ ██ ███████
We’re only being asked to explain why raisins have more iron per calorie than grapes, so the speed of iron absorption is irrelevant.
d
Raisins, but not ███████ ███ █████████ ███████████ ██ ████ ██████ ███ █ ███████ █████ ██ █████ ██████ ████ ██████ ████ ███████ ████ ████ ███████
We’re only being asked to explain why a raisin has more iron per calorie than a grape does, so it’s irrelevant how much of either food is consumed.
e
Raisins are often █████ ██ ███████████ ████ █████ ███████████████ ██████ █████ ██████ ███ ███████ █████ ██ ███████████
We’re only being asked to explain why raisins have more iron per calorie than grapes do, so people’s eating habits are irrelevant.