December 1998 LSAT Section 4 Question 9

The only physical factor preventing a human journey to Mars has been weight. Carrying enough fuel to propel a conven...

nathanielpfitzpatrick on July 8 at 05:57PM

Why is A wrong?

I was between A and E for this question, and last second changed from A to E. I can't quite realize why A is wrong. If there hypothetically was more fuel needed for the return back to Earth, wouldn't it be heavier therefore not able to return?

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Emil-Kunkin on July 20 at 02:23PM

The author doesn't need to agree with A. Would it kill the argument if it took 1 percent more or less fuel on the return journey? What if the return journey was actually much easier? Since the author doesn't have to believe it, it's not a necessary assumption.