Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

Option 1 suggests that only Oxides of Hydrogen and Nitrogen cause acid rain. This is incorrect since Oxides of Hydrogen do not contribute to acid rain.

Option 2 suggests that only Oxides of Sulphur cause acid rain. This is partially correct as Oxides of Sulphur do indeed contribute to acid rain, but it fails to mention that Oxides of Nitrogen also contribute, making this option incorrect.

Option 3 suggests that both Oxides of Nitrogen and Oxides of Sulphur cause acid rain. This is the correct answer. Both of these gases, when released into the atmosphere, can form acids that lead to the production of acid rain.

Option 4 suggests that Oxides of Hydrogen, Nitrogen, and Sulphur all cause acid rain, which is incorrect due to the reasons discussed above. Oxides of Hydrogen are not responsible for the formation of acid rain.