The Greenhouse Effect Occurs Because

The greenhouse effect occurs because:

A) greenhouse gases released interact chemically to produce excess heat.
B) there are too many greenhouses scattered across the Earth's surface.
C) carbon dioxide and other trace gases trap infrared radiation in the Earth's atmosphere.
D) sulfur emissions from smokestacks and volcanoes continue to occur.
E) the gases produced by human activities allow significantly more heat to pass out of the Earth's atmosphere.