In a rhetorical situation, what is the exigence? the message of the text—what the writer is saying about the issue at hand
the original reason for or cause of the writing—the issue that prompted the writer to say something
the purpose the writer has for writing—what the writer ultimately hopes to accomplish
the context for writing—the historical events and cultural movements surrounding the text’s creation

she was trying to use   reliable narrator.

the correct order is:

you're your own worst enemy:

they're going to say what they say, but

their opinions aren't holding you

back. it's your self-defeatist

attitude that's keeping your work

from getting its due.

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.)