Which of the Following Statements Provides Evidence That the Atmosphere

Which of the following statements provides evidence that the atmosphere of the early Earth was neither reducing nor oxidizing?

A) Lightning and UV radiation were abundant in the early Earth atmosphere.
B) Some evidence suggests that the early atmosphere was made up primarily of nitrogen and carbon dioxide.
C) Remnants of amino acids were discovered near volcanic eruption sites.
D) Modern experiments show that organic compounds were probably produced in deep-sea hydrothermal vents.