In What Crucial Way Is the Atmosphere of Earth Very

In what crucial way is the atmosphere of Earth very different from the atmospheres of Venus and Mars?

A) Earth's atmospheric temperature is relatively cool, whereas both Venus and Mars have very high atmospheric temperatures.
B) Methane (CH₄) gas is present in large quantities on Venus and Mars, but it is only a trace gas on Earth.
C) Hydrogen (H) gas makes up a large fraction of the atmospheres of both Venus and Mars, but it is absent from Earth's atmosphere.
D) Carbon dioxide (CO₂) gas is the dominant component in the atmospheres of Venus and Mars, but it is only a minor constituent in Earth's atmosphere.