Bunuel wrote:
Strawberries contain more fiber than bananas. However, since raspberries contain more fiber than peaches, it follows that strawberries contain more fiber than peaches.
If introduced into the argument as an additional premise, any of the following would make the argument logically correct except:
A Raspberries contain more fiber than strawberries.
B Strawberries and raspberries contain the same amount of fiber.
C Bananas and raspberries contain the same amount of fiber.
D Bananas contain more fiber than peaches.
E Bananas contain more fiber than raspberries.
OFFICIAL EXPLANATION
This is a weaken the argument question, because it asks us to find the additional premises that would make the question illogical.
Identify the argument. Because strawberries contain more fiber than bananas, and raspberries more than peaches, strawberries must contain more fiber than peaches.
If possible, anticipate what the answer will be. What would weaken the argument is if peaches contain more fiber than strawberries.
Eliminate answer choices that do not weaken the argument. Could peaches contain more fiber than strawberries if they have less fiber than bananas? NO. Could peaches contain more fiber than strawberries if raspberries have more fiber than strawberries? YES. If we look for the choice that opens up the possibility that peaches contain more fiber than strawberries, we have found our answer.
The only choice that does this is A. If raspberries contain more fiber than strawberries, we cannot know if strawberries contain more fiber than peaches