Answer:
I think your answer is 2.
Explanation:
You need to use FANBOYS : For, And, Nor, But, Or, Yet, and So.
And there is a But and so....
~ElAsesinoSilencioso♥
You have to tell us which words are underlined, but I have a feeling the words were "a popular author of children's books." which is an appositive. Author is the same thing as Shel Silverstein.