The correct answer is the context of major events.
Explanation:
The questions refers to Uncle Tom's Cabin, a book by Harriet Beecher Stowe about slavery, focused on Uncle Tom's life, a black slave. The Underground Railroad was established as a safe route with houses used by African-American slaves to escape to Canada and free states in the American Union during the early and mid 19th century. Abolitionists helped create and maintain this route across time. The novel by Stowe starts in Kentucky, one of the states crossed by the Underground Railroad that was used to set the context of major events that led to the American Civil War, so A is the correct answer.
