Logical reasoning PrepTest 130 · Section 4 · Question 10

Incorrect. Increasing the group that needs to take vitamin pills to include some who do eat enough servings of fruits/veggies won't weaken a conclusion about people needing to take vitamin pills.

Incorrect. Great trap answer! This answer is trying to get you to think that people might be able to meet their requirements by eating fewer servings of these commonly available super-fruits. However, first, this answer is about nutrients, not vitamins. And second, even if it were about vitamins, the answer doesn't establish that there are enough additional nutrients in the super-fruits to make up for the "far less" than five servings most people eat.

Incorrect. The disagreement noted here could be minimal differences that aren't nearly enough to account for the "far less" fruits/veggies eaten by most people.

Correct. Argument or Facts:
Argument

Valid or Flawed:
Flawed

Question Type:
Weaken

Stimulus Summary:
Vitamin requirements can be met with 5 servings of fruits/veggies, but most people don't eat that many, so most need vitamin pills.

Answer Anticipation:
This argument is all about ensuring that you get your necessary vitamins. One route? Eating 5 servings of fruits/veggies each day. However, the stimulus notes that most people don't hit this target, so they'll need to get their "daily requirement" of vitamins elsewhere. That alternative source is then concluded to be vitamin pills—something that most people will "need" to take.

That's a strong conclusion, though, and it treats vitamin pills as the only source of vitamins other than fruits/veggies. However, it never establishes that other sources don't exist, so any answer choice that brings that up—or brings up a specific alternative source of vitamins that could preclude the need to take a pill—would undermine this conclusion.

Answer Explanation:
This answer highlights a place where people may get the necessary vitamins outside of fruits, veggies, and vitamin supplements. If manufacturers put vitamins in other foods, then one could eat far fewer than the recommended servings of fruits/veggies and still get enough vitamins without resorting to vitamin pills.

Key Takeaway:
Strong conclusions need strong premises to back them up. And recommendations should make you think about alternatives. Here, the conclusion makes a recommendation about something that people "need" to do without backing up that there aren't alternatives.

Incorrect. The argument is about vitamins, so fiber is out of scope.