The Analogy of a Greenhouse Is

The analogy of a greenhouse is

A) a useful,but inaccurate model since atmospheric gases do not trap,but absorb heat.
B) exactly how Earth-atmosphere system operates.
C) while it incorrectly describes shortwave energy transmission,it perfectly encapsulates how longwave terrestrial radiation is trapped.
D) completely unrelated to our Earth-atmosphere system,and should never have been used to describe global warming.