What is the meaning of the phrase "greenhouse gases" in reference to climate change?

A. Methane, water vapor, and carbon dioxide improve plant growth in greenhouses.
B. Methane, water vapor, and carbon dioxide trap heat, as do greenhouses.
C. Methane, water vapor, and carbon dioxide are rare gases in greenhouses.
D. Methane, water vapor, and carbon dioxide improve plant growth on Earth.
E. Methane, water vapor, and carbon dioxide are common gases in greenhouses.
F. I DON'T KNOW YET