Final answer:
The presentence investigation (PSI) report is completed by a parole officer. This report aids a judge in deciding on an appropriate sentence by providing a detailed background of the convicted individual.
Step-by-step explanation:
The individual responsible for completing the presentence investigation (PSI) report is d) Parole officer. A PSI is an investigation into the history of a person convicted of a crime before sentencing to determine if there are extenuating circumstances which should amplify or mitigate the sentence. This report is crucial for the judge in making an informed decision regarding sentencing. The process of a trial typically involves the prosecution and defense presenting their arguments, testimony, and evidence. Once the jury or judge reaches a verdict, if the defendant is found guilty, the next step is sentencing. The PSI report provides the judge with a detailed background of the defendant to aid in issuing an appropriate sentence based on the law and the specifics of the case.