To solve this problem, we need to identify which pair of gases is mainly responsible for the greenhouse effect.$\newline$Let's analyze each option:$\newline \bullet$Option 1: Ozone and Ammonia$\newline$ - Ozone is a greenhouse gas, but ammonia is not a significant contributor to the greenhouse effect.$\newline \bullet$Option 2: Oxygen and Nitrogen$\newline$ - Oxygen and nitrogen are the most abundant gases in the atmosphere but are not greenhouse gases.$\newline \bullet$Option 3: Nitrogen and Sulphur dioxide$\newline$ - Nitrogen is not a greenhouse gas, and sulphur dioxide, while it can affect climate, is not a major greenhouse gas.$\newline \bullet$Option 4: Carbon dioxide and Methane$\newline$ - Both carbon dioxide and methane are significant greenhouse gases and are major contributors to the greenhouse effect.$\newline$Therefore, the correct pair of gases responsible for the greenhouse effect is:$\newline$Option 4: Carbon dioxide and Methane$\newline$This corresponds to the correct option, which is Option 4.