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: Earth's atmosphere contained very little, if any, oxygen 2. 9 billion years ago.
B: Most diamonds with higher-than-normal concentrations of sulfur-33 were formed at least 2. 9 billion years ago.
C: Ultraviolet light causes the oxygen in Earth's atmosphere to react chemically with sulfur-33.
D: The formation of diamonds occurs only in the presence of ultraviolet light.
Choose A, B, C or D as your solution.
A