There should be a greater use of gasohol. Gasohol is a mixture of alcohol and gasoline, and has a higher octane rati...

Anna20 on February 2, 2021

Gasohol

Hello - I was stuck between C and D here on this question. How would you approach this? Thank you!

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SamA on February 6, 2021

Hello @Anna2020,

First I will break down this argument.

Conclusion: There should be a greater use of gasohol.
Premise 1: Higher octane rating and fewer carbon monoxide emissions.
Premise 2: Doesn't add more carbon dioxide than plants can remove.

The 4 wrong answers are going to strengthen the argument.
The right answer will either weaken it or do nothing.

Answer choice D is a pretty strong supporter of the argument, so we can eliminate it. However, I can see why answer choice C was confusing. For this question, it is safe to assume that fuel efficiency is a good thing. C says that cars burn more gasohol per KM than they would burn gasoline. This means that gasohol is less efficient, which makes C the right answer by weakening the argument.