Explanation
A. The passage does not present two complementary theories in the second paragraph to be contrasted and one rejected in the third paragraph. It discusses one theory and later introduces new data that affects the consideration of that theory.
B. The passage doesn’t indicate that the theory discussed in the second paragraph is problematic or that it is tentatively rejected in the third paragraph. Instead, it presents an evolution of understanding based on new evidence.
C. (Correct Response) The passage outlines how the original greenhouse theory, which might have been questioned due to the role of solar cycles and sulfates, is given further credibility with the introduction of recent data and calculations that support the warming trend and the impact of greenhouse gases.
D. The author does not substantially revise a theory they propose and defend. The passage simply elaborates on how new findings support an existing theory.
E. The passage does not suggest that the validity of the greenhouse effect is in question; it reinforces the theory with recent data and challenges the sufficiency of alternative explanations.
The passage details how the introduction of new evidence regarding sulfates and the consistent rise in temperature over recent decades supports the greenhouse theory initially discussed, leading to a more accepted understanding of the theory's validity.