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During the 1950s, psychology and social psychological research played key roles in the new focus on prisoner's health and well-being. This resulted in more freedom for those in prison facilities. At the same time, overcrowding was an ongoing problem. In the 1960s and 1970s, the new freedoms and the overcrowding led to _____.

an increase in the number of clergy hired to work in correctional institutions
prison riots and increased interpersonal violence
an increase in products and services made by the incarcerated
an increase in the use of solitary confinement