Explanation:

• Correct Option: (b) Explanation:  Option (b) is correct Supplementary notes: Composition of Atmosphere: Chemical Characteristics  The atmosphere is composed of a mix of several different gases in differing amounts.
• The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%.
• Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.
• Water vapor is unique in that its concentration varies from 0-4% of the atmosphere.
• In the cold, dry artic regions water vapor usually accounts for less than 1% of the atmosphere, while in humid, tropical regions water vapor can account for almost 4% of the atmosphere.
• Greenhouse gases whose percentages vary daily, seasonally, and annually have physical and chemical properties which make them interact with solar radiation and infrared light (heat) given off from the earth to affect the energy balance of the globe.