PT 59 S2 Q25

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About 3 billion years ago, the Sun was only 80 percentas luminous as it ... ...

Which one of the following, if true, weakens the argument?
(A) Sufficient heat to keep the oceans liquid 3 billion years ago could not have been generated through geological processes such as volcanic activity.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-A, Dec. '09 LSAT (PT 59 Sec. 2)

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