Final answer:
The presence of police on college campuses increased significantly to suppress protests due to the rise in student activism in the 1960s.
Step-by-step explanation:
According to Kendi's accounts of student activism and subsequent police reaction in the 1960s, the answer to the question is: A. It increased significantly to suppress protests. This increase in police presence on college campuses was in direct response to the growing student activism, primarily aimed at contesting controversial social and political issues of that era such as civil rights and the Vietnam War.
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