The Psychologist Diederik Stapel Published Fraudulent Research Results for Decades

The psychologist Diederik Stapel published fraudulent research results for decades before his deception was uncovered.When caught,Stapel was:

A) fired from his academic position and had his publications retracted.
B) verbally warned to stop engaging in fraudulent behaviour;no further action was taken due to the lack of an enforcement agency.
C) forced to retract those publications in which fraudulent data appeared but allowed to keep his academic position.
D) fired and sent to prison for 5 years for his fraudulent activities.