Jack has been subpoenaed to testify before a grand jury concerning a money laundering case. Jack does not want to comply with the subpoena because of his concern that doing so will reveal that he was engaged in criminal conduct. On the advice of his attorney, Jack pleads the Fifth Amendment. The government responds to his plea by providing him with immunity.

In grand jury investigations, what is the scope of protection afforded to Jack by a grant of immunity?

a The government cannot use anything Jack says or that is derived from his testimony against him in a criminal prosecution

b The government cannot prosecute him

c The government cannot use his testimony against him

d The government cannot use any evidence relating to the criminal transaction against him