In the first passage, "Silent Spring" the tone of passage is dark and horrifying, while in "Save the Redwoods" the tone of the passage is lighter than the first one. Thus, option C is correct.
The tone of the passage of the article is the attitude that the writer has over the subject matter that expresses the opinions and ideas to the readers so as to develop the theme.
In Rachel Carson's Silent Spring he expresses the dark tone to aware the readers about the seriousness of the issue while in Muir's "Save the Redwoods," he expresses words with a lighter tone that addresses the matter.
Therefore, option C. the first passage has a horrifying tone, while the second is lighter.
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