The correct answer is b. It promises the scope, purpose, and direction of the essay.
Step-by-step explanation:
A thesis statement is a statement that expresses the position of the author about some topic, subject or situation and which is considered as the main point or claim that guides the essay. This means the purpose of all the content of the essay is to support, show or explain the thesis statement and in general terms, an essay cannot stand without a thesis statement. Considering the importance of the thesis statement for the essay previously described, the reader will need to be exposed to this thesis statement as soon as it is possible or at the beginning of the essay so he can know what the essay is about, the scope or objectives of it, the purpose or if it intends to inform, persuade or explain; and the direction or focus of the essay and then understand properly all the information, details and evidence provided in the essay by knowing exactly what is the position of the author. Thus, it is important that the thesis statement appears at the beginning of your essay because this exposes the reader to the scope, purpose, and direction of the essay, in this way, the reader has enough information to really understand your position.