Final answer:
A grand jury is responsible for indicting a criminal,(option a) meaning they review evidence and decide if there's enough to prosecute. The petit jury, on the other hand, determines guilt or innocence during the trial, and does not partake in the indictment process.
Step-by-step explanation:
The role of juries in the indictment process is correctly identified as: a. grand jury indicts a criminal. A grand jury is a group of citizens charged with determining whether there is enough evidence of a crime to prosecute someone. In contrast, a petit jury, also known simply as a trial jury, is responsible for hearing the arguments and evidence during a criminal trial and then determining the innocence or guilt of the accused. The grand jury’s function is primarily to conduct a review of evidence presented by the prosecutor and issue indictments if they believe there is sufficient evidence to proceed to trial.
While a grand jury decides whether to indict, the trial process includes a petit jury, which listens to the evidence presented and reaches a verdict. It is important to note that the two types of juries do not work together in the indictment process. Additionally, options b, c, and d are misrepresentations of the process, as the indictment is solely the grand jury’s responsibility.