Nitrogen is chemically inert. Sodium vapor reflects solar energy. Carbon dioxide traps solar energy. Argon is unable to react with water.
I gave my students this multiple choice question: Which statement describes a characteristic of a gas that has a significant effect on the climates of both Earth and Venus?

Only one answer is correct among these 4 choices:
- Nitrogen is chemically inert.
- Sodium vapor reflects solar energy.
- Carbon dioxide traps solar energy.
- Argon is unable to react with water.

Could you tell me which one is correct?

Carbon dioxide traps solar energy.