According to contextual perspective, the statement that best supports the idea that Turner took a positive view of the effects of the frontier on American History is that "The result is that to the frontier the American intellect owes its striking characteristic."
This implies that by holding a positive view of the frontier, Frederick Jackson Turner attributes good traits and praises to the frontier.
If Frederick Jackson Turner concludes that the American intellect owes its striking characteristic to the frontier, the frontier has positive impacts on American history and society.
Hence, in this case, it is concluded that the correct answer is option D.
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