To identify the fifth most abundant greenhouse gas in the atmosphere from the given options.

The question asks to identify the fifth most abundant greenhouse gas in the atmosphere from the given options.

First, let's identify which of the options are actually greenhouse gases:

• a. Methane ($\text{CH}_4$): This is a greenhouse gas.
• b. Nitrogen ($\text{N}_2$): This is the most abundant gas in the atmosphere, but it is not a greenhouse gas as it does not absorb infrared radiation.
• c. Carbon dioxide ($\text{CO}_2$): This is a greenhouse gas. (Note: "dloxide" is a typo for "dioxide").
• d. Oxygen ($\text{O}_2$): This is the second most abundant gas in the atmosphere, but it is