Concept:The temporary or permanent release of a prisoner before the end of a sentence, on promise of good behaviour, is called parole.
Explanation:The sentence says the prisoner assured the authorities that he would not escape.
After that assurance, he was released, so the correct expression is "released on parole".
"Parole" is used for a prisoner who is set free before completing the full term, under certain conditions.
"Probation" refers to a period of supervision given instead of imprisonment, not release from prison.
"Suspension" means being temporarily stopped or postponed, which does not fit here.
The remaining option, "recored", is not appropriate in this context.
Thus, the best word to complete the sentence is "parole".
Answer:C. parole