Which Greenhouse Effect and Global Warming term is correctly associated with important distinction or response: “warmer air can hold more moisture”, and also with “the most abundant natural greenhouse gas”?

Correct Answer: Option D — Water vapour. Water vapour is correct because it is warmer air can hold more moisture. Water vapour is also associated with the most abundant natural greenhouse gas. A further identifying fact is that Water vapour is acts mainly as a climate feedback rather than the initial human forcing. Another useful fact is that Water vapour is associated with warmer air can hold more moisture. Why the other options are incorrect: Option A — Tropospheric ozone: It is it should not be confused with protective stratospheric ozone and is associated with a secondary air pollutant and greenhouse gas. Option B — Greenhouse effect: It is human emissions strengthen the natural effect and is associated with a natural atmospheric warming process. Option C — Global warming: It is it is one component of broader climate change and is associated with a long-term rise in Earth's average surface temperature. Exam Takeaway: Link Water vapour with “warmer air can hold more moisture” and “the most abundant natural greenhouse gas” for quick revision.