Answer:
D. There would likely not be life on Earth because its surface would be much colder and Earth's water would be frozen.
Step-by-step explanation:
The greenhouse Gases in the Earth's atmosphere has the capability to let sun light run pass through the atmosphere, and trap the heat within the Earth after doing so.
This heat is what keep our current Earth had a livable temperature for most plants and animals.
Without the green houses gases, the average temperature in earth will be lowered and the vast majority of life forms that we currently know will most likely go extinct.