Assertion:. With increasing use of varieties of fuels as the source of energy, there is a marked increase in emission of toxic gases into the atmosphere resulting in the pollution of air.
Reasoning: Combustion of fossil fuels, mining and industries are the main sources of air pollution.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

The correct answer is Option 1:Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

• Assertion (A): The increasing use of various fuels as energy sources directly leads to a greater release of toxic gases into the atmosphere, causing air pollution. This statement is true. Different fuels, especially fossil fuels, release various pollutants upon combustion.

• Reasoning (R): The combustion of fossil fuels, mining activities, and industrial processes are indeed the primary sources of air pollution. This statement is also true. These activities release significant amounts of particulate matter, sulfur oxides, nitrogen oxides, carbon monoxide, and other harmful substances into the air.

• Reasoning as the correct explanation of Assertion: The reason why the increasing use of fuels causes a marked increase in toxic gas emissions (Assertion) is precisely because the combustion of fossil fuels (a major category of fuels), along with emissions from mining and industries that often support energy production and consumption, are the main sources of air pollution (Reasoning).