Discussion
The greenhouse gases trap the energy reflected :
Answer: B
Greenhouse gases trap energy from the earth and keep the earth warm.
Sunlight, mostly short-wave radiation, passes through the atmosphere largely unabsorbed and warms the surface. The warm surface then radiates long-wave (infrared) energy back upward. Gases such as carbon dioxide, water vapour and methane absorb this outgoing infrared radiation and re-emit part of it downward, so the surface stays warmer than it otherwise would, by about 33 °C.
They do not mainly act on incoming sunlight, and their effect is warming, not cooling, which rules out the other three options.
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