Option 1 (a, c, and d) is the correct answer. Greenhouse gases are gases that trap heat in the Earth`s atmosphere and contribute to the greenhouse effect. Carbon dioxide (a) is one of the main greenhouse gases emitted from burning fossil fuels, deforestation, and other human activities. Nitrous oxide (c) is another greenhouse gas primarily emitted from agricultural and industrial activities. Water vapor (d) is also a greenhouse gas, although its concentration in the atmosphere is primarily influenced by temperature and moisture content.

Option 2 (a and d), Option 3 (a and c), and Option 4 (a, b, and d) are incorrect. Nitrogen (b) is not a greenhouse gas. While it is the most abundant gas in the Earth`s atmosphere, it does not possess the ability to trap heat like greenhouse gases do.

Therefore, the correct answer is Option 1 (a, c, and d).