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Life originated 500 million years before the origin of the Earth.

The majority of matter in the universe consisted of hydrogen and helium before the Big Bang.

The primitive Earth had a reducing atmosphere.

The atmosphere of the primitive Earth contained high amounts of free oxygen.

answer is C.

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Detailed Solution

The primitive Earth’s atmosphere was a reducing atmosphere. It lacked free oxygen and contained high amounts of reducing gases like methane, ammonia, hydrogen, and water vapour. These gases have a strong reducing effect, meaning they tend to donate electrons to other molecules and reduce their state of oxidation.
Life originated 500 million years after the origin of formation of the Earth.
According to the Big Bang theory, immediately after the Big Bang, the universe was hot and dense enough for nuclear fusion to occur. At this time, the majority of matter in the universe consisted of protons and neutrons. As the universe cooled, these particles combined to form atomic nuclei, with the vast majority being hydrogen and helium nuclei.

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