Answer: (C) Ten years ago, Barraland reformed its criminal justice system, imposing longer minimum sentences for those crimes for which a prison sentence had long been mandatory.
Step-by-step explanation:
If longer minimum sentences for those crimes for which a prison sentence had long been mandatory have been imposed, we could infer that the higher population is not due to a rise in the number of prison sentences, but on longer sentences which leads to more people being imprisoned at the same time.
The fact that overcrowding in the prisons of Barraland has been eliminated due to a program of prison construction, doesn´t contradict the idea of imprisonment being on the rise. Furthermore, the need to construct goes with the rise in the population.
Parole violations becoming significantly less frequent would lead to fewer prisoners, not more.