What is the tone of a text? O the author's attitude toward the subject
O the author's way of choosing and ordering words
O the reader's attitude toward the text
O the reader's interpretation of a subject

I am pretty sure that the excerpt from Silent Spring best appeals to readers’ pathos is D.Yet every one of these disasters has actually happened somewhere, and many real communities have already suffered a substantial number of them. A grim specter has crept upon us almost unnoticed, and this imagined tragedy may easily become a stark reality we all shall know. 
I choose this one because in these lines author appeals to emotions.