Which One the Following Is Most True

Which one the following is most true?

A) Once seen as a way to control and reward inmate behavior by granting early release from prison, the use of parole changed in the 1970s and became more of a release valve for burgeoning institutional
Populations.
B) The concept of parole developed in the 19th century to reduce burgeoning prison populations.
C) Parole was initially developed to be a release valve for overcrowded prisons but in the 1970s it became more of a way to keep inmates from being disruptive during their prison stint so they could earn release
More quickly.
D) Throughout its almost 150 year history, the practice of parole has steadfastly been used to reward positive inmate behavior and not to reduce prison populations.