How Did the Young Historian Frederick Jackson Turner Respond to the Growing

How did the young historian Frederick Jackson Turner respond to the growing anxiety of Americans in 1893?

A) He revealed the sexual relationship between Thomas Jefferson and one of his slaves.
B) He discovered the historical origins of the economic depression of the 1890s.
C) He argued that the "closing" of the frontier would have devastating consequences for American society.
D) He laid out in precise detail how Americans had acted like imperialists against Native Americans for most of the 19th century.