though I can't be sure without seeing the passage first, I presume its option C) "she has a right", because it has the most assertive and passionate tone as far as I can tell.
A comparison using like or as is a simile.
I believe it is the introduction which should be relatively brief. You shouldn't prolong it too much, because the emphasis should be put on the main part of your speech, and not so much on the introduction.
I agree with the person above - to make an inference indeed means to figure out the hidden meaning of a text. Usually, you would do this based on some clues that the author has written over the course of the novel you are reading at the moment.