Book Reports / Iago, thesis for Othello? [4]

Okay I have to come up with a thesis statement for one of the three topics:

1. Shakespeare presents his audience with three very different women: Desdemona, Emilia and Bianca. Choose [one] and discuss what Shakespeare is attempting to accomplish through this character and explain what he is asserting about women in general.

2. Iago could be defined as a character with a malignant heart, or no heart at all. He seems to act with no motive other than the desire to cause others to suffer. Discuss how Iago is so successful at playing this role of "puppet master" and how he is able to manipulate the heart and mind of Othello.

3. In the play there seems to be an ongoing conflict between what characters seem to be initially and who they actually turn out to be at the play's end. Consider "Honest Iago," the "noble Moor," or the "fool Roderigo" and explain how this character is more than he appears to be by the end of the play.

My problem is coming up with a excellent and interesting thesis statement; I have a hard time doing this.

I'm more interested in using the second topic, but I don't know where to start. If anyone can help me, that would be great. Please!! I really need help