What is the function of a grand jury?

The function of a grand jury is to evaluate whether there is sufficient evidence to formally charge an individual with a crime, which is known as an indictment. This process is crucial in the legal system, as it serves as a check on the government's power to bring individuals to trial without substantial evidence. Grand juries consist of a group of citizens who review evidence presented by prosecutors, and they serve to ensure that there is a reasonable basis for proceeding with criminal charges. This step helps protect citizens from unfounded accusations and ensures that only cases with enough evidence go to trial.

In contrast, the other options represent different aspects of the judicial process. Deciding the verdict of a trial is the function of a petit jury, not a grand jury. Reviewing sentencing guidelines typically falls under the purview of judges and not juries in general. Offering plea deals to defendants is a function that involves negotiation primarily between the defense and the prosecution, rather than a role played by a jury.