The correct answer is C. In a felony case, the purpose of a grand jury is to hear and review evidence presented by the Assistant District Attorney. Next, they decide if the Court should issue a formal indictment or if evicence is not enough to do so.
According to the provisions of the Fifth Amendment, all felonies must have a Grand Jury in their trials (but not in the case of minor crimes).
In a felony case, the purpose of a grand jury is to "<span>C. decide if the evidence warrants prosecution," since oftentimes there isn't enough evidence for the prosecution to make an effective case. </span>
