51 RC Passage 2
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Permalink Submitted by amyframy on Dec 24 2020
Re: Q13, this is how I arrive at A. Line 55 (also the "S") says to determine the pervasiveness of LHB, we need more rocks from other planets.
Contrapositive of this is: if we cannot find more rocks from other planets, then LHB is not pervasive.
A: We searched Mars and we didn't find more rocks. So it supports that LHB is not pervasive, i.e., limited to earth and moon.
D: Using the logic above, D does not seem relevant.
Is this thinking correct? I chose D in my first attempt at this PT but now doing this again I think I know why A is right and D is not.

Permalink Submitted by majorgeneraldave on Jan 14 2021
I think you're right on!
Good work. Keep it up!