Final answer:
The correct answer is none of these are methane sources.
Step-by-step explanation:
The correct answer is a. none of these are methane sources. Methane is found in several locations, including wetlands, paddy fields, and landfill gas emissions.
In the rumen of cows and other ruminant animals, a different gas called methane is produced as a byproduct of their digestion. This methane is released into the atmosphere through the animals' burps and contributes to greenhouse gas emissions.
Therefore, the only option that is not a location where methane is found is a. none of these are methane sources.
Learn more about Methane sources