The best and most correct answer among the choices provided by your question is the first choice or letter A. The conclusion that could be drawn from the paragraph is that "<span>in a greenhouse, the Sun's heat is trapped by the glass."
Because of this greenhouse effect, global warming takes place. It is an abnormal rise of temperature which results to the melting of our polar ice caps.
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I have a feeling it is D. Cause it basically says that the glass in a greenhouse traps the sunlight keeping the plants warm so likewise the atmosphere keeps the Earth warm..
