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Zimbardo's Stanford prison experiment of 1971 had to be ended after only:

ASix weeks
BTwo months
COne year
DSix days
Answer & Solution
Correct answer: D. Six days
1. Guards became sadistic and prisoners hopeless. 2. It ended after six days. 3. Even Zimbardo acted as a real prison supervisor. _Source: OpenStax Psychology 2e, Chapter 12, Social Psychology (CC BY 4.0)._
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