A thesis is a part of research that describes the title with the result. In Canyons of Colorado, the author describes his thesis with direct statements and examples. Thus, option A is correct.
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A thesis is a claim or a statement that provides proof for the research subject and includes conclusive results and outcomes to justify the matter. It can be stated as a preposition that has been already proved or is in process.
In the text, the writer directly makes the statement and then states a few examples and reasonings to support the thesis statement. The research question is addressed directly and is supported by the examples.
Therefore, in Canyons of Colorado, John Wesley Powell introduced his thesis with a direct statement and examples.
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