Answer:
a. How Thoreau protested
Explanation:
In the passage, the author shows how Thoreau protested. The author tells us that Thoreau protested laws that he believed were unfair. This included the Mexican-American War and slavery. Thoreau protested these laws by refusing to pay the poll tax. He was eventually arrested for this practice, and his acts and writings set the basis for civil disobedience all over the world.
I believe the answer is C. Even though they can all be good.
Generally with an executive summary
telling the purpose of the report and aims and objectives