The correct answer is C. Sulphur dioxide.
Sulphur dioxide is a gas that is released into the atmosphere when fossil fuels such as coal and oil are burned. It can also be released from natural sources such as volcanoes. Sulphur dioxide reacts with water in the atmosphere to form sulphuric acid, which is a major component of acid rain.
Carbon dioxide is a gas that is released into the atmosphere when fossil fuels are burned. It is also a natural part of the atmosphere. Carbon dioxide does not cause acid rain.
Carbon monoxide is a gas that is released into the atmosphere when fossil fuels are burned. It is a poisonous gas that can cause death. Carbon monoxide does not cause acid rain.
Methane is a gas that is released into the atmosphere from natural sources such as wetlands and from human activities such as agriculture and waste management. Methane is a greenhouse gas that contributes to climate change. It does not cause acid rain.