Ethos can best be described as... A) An appeal to an audience's emotions
B)An appeal to an audience's logical reasoning
C) An establishment of credibility

C.

Explanation:

Ethos means ethics or someone's credibility

"a" because he is appealing to logic as oppose to appealing to the audience's emotions.

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)