In this passage from the declaration of independence, jefferson was employing which persuasive technique? a. appeal to ethics b. appeal to emotion c. appeal to logic d. appeal to authority

As the passage is not added, it would refer to the text in general. 
It could be said that in his Declaration of Independence, Jefferson appealed to logic (option C) His detailed explanation of what was wrong about the government against colonies was based on a rational justification for the revolution. He expected the reader to follow his way of thinking, his reasoning. 

In the sentence above, the clause "Romeo and Juliet" must be presented in italics.

We can arrive at this answer because:

When writing a sentence, any mention of the title of a work of art, or literary work, must be presented in italics, or quotation marks.This signals the reader that a work of art is being cited, something that does not belong to that text, but is part of what the reader should read.

"Romeo and Juliet" is a play, being both an artistic and a literary work, and therefore must be presented in italics or quotation marks, when cited in a sentence.

More information about "Romeo and Juliet" at the link:

link