On Venus, Large Amounts of Carbon Dioxide (CO₂₎ Have Come

On Venus, large amounts of carbon dioxide (CO₂₎ have come from the planet's interior to form a thick CO₂ atmosphere. What is the carbon dioxide situation on Earth?

A) Earth, too, has an atmosphere that is mostly CO₂.
B) Earth's interior is entirely different from that of Venus, so that it never produced much carbon dioxide.
C) Earth's carbon dioxide is mostly dissolved in the oceans and locked up in carbonate rocks.
D) Earth's carbon dioxide has mostly escaped because Earth's gravity is so much weaker than that of Venus.