Final answer:
The correct answer is b) Greenhouse gases, Ozone, as greenhouse gases are the primary factors trapping heat in our atmosphere, and ozone is a secondary factor.
Step-by-step explanation:
The main factors for trapping heat in the Earth's atmosphere are greenhouse gases, with ozone being a secondary factor that also traps heat. Therefore, the correct answer to the student's question is b) Greenhouse gases, Ozone. Greenhouse gases include carbon dioxide, methane, water vapor, nitrous oxide, and ozone, all of which have a significant impact on the greenhouse effect. This effect is essential for life on Earth, as it maintains global temperatures within a range necessary to sustain life; without it, the planet would be much colder.