Gases Such as CO₂ and Methane Are Considered Greenhouse Gases

Multiple Choice

Gases such as CO₂ and methane are considered greenhouse gases.This is because

A) they are the most common in the atmosphere allowing them to trap more heat than the other gases.
B) they form covalent bonds and hence can easily act as a shield for heat.
C) the vibrational modes of the molecules are in the infrared region which imply that they readily absorb radiant heat thus preventing it from escaping into space.
D) the gases are formed by human activity resulting in offsetting the natural balance in the gas concentrations.
E) None of the above statements is correct.