Logical reasoning PrepTest 151 · Section 3 · Question 6

Correct. Argument or Facts:
Argument

Valid or Flawed:
Flawed

Question Type:
Strengthen (Principle)

Stimulus Summary:
Shrimp were introduced to a lake to feed the salmon, but they ended up eating the baby salmon's food, starving them. Therefore, we should eliminate the shrimp rather than some other solution (fishing trout).

Answer Anticipation:
Two solutions are on offer, and Lopez picks one over the other. The correct answer will give a reason why the selected solution should be picked. Any information learned about that method could lead to the correct answer, as long as it connects it to justifying that option over others, so we need to stay flexible when looking at the answers.

Answer Explanation:
This answer applies to the shrimp, which we learned were introduced to the lake, and are thus non-native. If eliminating them is preferable to all other methods, then it's certainly preferable to fishing trout, and thus this is the correct answer.

Key Takeaway:
When a conclusion picks one option over another in a Strengthen question, the correct answer will often give a reason to this that option is better than the alternative.

Incorrect. There's no indication as to whether eliminating shrimp or fishing trout is faster.

Incorrect. If anything, this answer justifies not eliminating the shrimp.

Incorrect. This answer would justify not introducing the shrimp in the first place, but it doesn't justify any action once they're there.

Incorrect. The goal is to protect the salmon, not necessarily increase their number. Lopez's plan also protects the baby salmon, not the ones at the prime reproductive age.