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To find the percentage of college students that prefer history, we need to divide the number of college students who prefer history by the total number of students and multiply by 100%.
The number of college students who prefer history is 70.
The total number of students is 400.
Percentage = (70/400) x 100%
Percentage = (0.175) x 100%
Percentage = 17.5%
Therefore, the correct answer is A. 17.5%.