An author appeals to logic by

using emotionally charged language
providing evidence to back claims
relying on a reader's sense of justice
keeping his writing organized

The right answer is "providing evidence to back claims "

Thus, the complete sentence is:  "An author appeals to logic by providing evidence to back claims "

To make an appeal to logic, the author has to convince the reader that the position on a subject being exposed is reasonable. For this, it is necessary to justify, to gather facts or examples that have credibility, that is, to present a series of evidences that support the arguments elaborated.

i'm pretty sure it is 1) wants to hide her true feelings about robert. i'm sorry if it is wrong. good luck! : d

i think one answer could be this poet uses no rhyme.