B. It must concisely state the main idea of the essay.
The thesis statement is the main idea of the entire essay. It should be in the introduction paragraph of the essay to give the reader a clear indication of the author's purpose. Option A is incorrect because it describes a topic sentence, not a thesis statement. Option C is incorrect because the entire essay should support the thesis not just the introduction and conclusion. Option D is also incorrect. You need a working thesis statement for the planning stage. As you plan and write the essay, the thesis statement may need to be revised, but it is always necessary.
The statement which is true about a thesis is it must concisely state the main idea of the essay. Thus the correct answer is B.
A statement whose validity has been proved or justified in some way is referred to as a thesis at the start of an argumentative text. This thesis is considered the viewpoint of the whole argument.
This will informs readers about what they are going to read so that they can get a clear idea about the whole topic and understand the arguments effectively.
Therefore, option B must concisely state the main idea of the essay is the appropriate answer.
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