Question

A thesis statement must always _____.

Answer 1

The correct answer is both a and b. 

A thesis is located at the end of the introductory paragraph and begins the body paragraphs of your essay/paper.

A thesis is like a roadmap for your essay, project, paper, etc.  It needs to guide the reader through your text, and also be provable.

Answer 2

A thesis statement must always MAKE AN ASSERTION TO BE PROVEN BY THE BODY OF THE TEXT.

It can come either at the beginning of the introduction or at the end of it.