One key reason sociologists say that the United States is currently in an era of mass incarceration is because a. minor-age prisoners who have committed violent crimes are often now housed with adult offenders. b. the sizable prison population in the United States is largely concentrated in just a few correctional facilities. c. most industrialized democracies have lower incarceration rates than the United States. d. most industrialized democracies have low incarceration rates despite having capital punishment