Scientists examined diamonds that were formed on Earth about 2.9 billion ... ...

Scientists examined diamonds that were formed on Earth about 2.9 billion years ago. These diamonds had a higher-than-normal concentration of sulfur-33. This concentration can be explained only by certain chemical reactions that are stimulated by ultraviolet light. If there had been more than a trace of oxygen in Earth’s atmosphere 2.9 billion years ago, then not enough ultraviolet light would have reached Earth’s surface to stimulate the chemical reactions. The information above most strongly supports which one of the following?
(A) Most diamonds with higher-than-normal concentrations of sulfur-33 were formed at least 2.9 billion years ago.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning A

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