If the Greenhouse Effect Did Not Exist,what Would Happen to Earth

Multiple Choice

If the greenhouse effect did not exist,what would happen to earth?

A) Earth would be too cold to support life as we know it.
B) Earth would be much too hot to support life as we know it.
C) Earth would be too wet to support life as we know it.
D) Our environment would be greatly improved.
E) It would make no difference.