3. in a felony case, the purpose of a grand jury is to

a. judge on a civil indictment.
b. decide if the evidence warrants prosecution.
c. decide if the offender should be tried by a jury.
d. judge the merits of the case against the state constitution.

B. decide if the evidence warrants prosecution. 

The question is asking to choose among the following choices that states the purpose of a grand jury in a felony case and base on my research, I would say that the answers would be in letter B. decide if the evidence warrants prosecution. I hope you are satisfied with my answer and feel free to ask for more