Hey MatloccerSha,
I would have to say that the answer is answer choice 2, because 1 and 3 simply don't cut it when defining a thesis statement. For the first choice, a thesis statement and research for it should be most often focused on one topic. For the third choice, a thesis is used all throughout the process of creating of an essay. A proper thesis statement should do a good job of summarizing what your essay is about. Hope this helped.