Greeting's!
<span>C) to little speculation
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C) is a fragment because it isn't a complete sentence. Hope this helps.
Answer: C is the best answer
this question is weirdly phrased, I picked C through process of elimination. Here's my reasoning:
It cannot be A because although the paragraph explains what greenhouses are, that it not the point of the passage. It is not B because even though the greenhouse effect is mentioned it does not explicitly say it is <em>changing </em>the atmosphere - just the temperature of the Earth. It is not D because according to the paragraph the greenhouse effect is exactly why the suns heat cannot escape.
The boat is you. the song is about fighting for life and freedom, etc. Yet the boat is also fighting, but its fighting the waves of a roaring ocean. understand?