Assertion (A) : The concentration of methane in the atmosphere has more than doubled in the last 250 years.
Reason (R): Wetlands and rice fields are the major sources of methane.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
B. It both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
C. If Assertion is true statement but Reason is false.
D. It both Assertion and Reason are false statements.

Answer

a

Explanation

Hydrocarbon are major air pollutants. Methane is produced naturally during decomposition of organic matter. Incomplete biomass comustion. Its concentration was 700 ppb in pre industrial times and 1750 ppb in 2000. so that concentration has more than doubled in the last 250 years. Flooded paddy fields. marshes, cattles etc are the major sources of this gas.