Johnny Has Been Drinking Heavily for Several Hours, Celebrating His

Johnny has been drinking heavily for several hours, celebrating his 21st birthday, and then robs a liquor store. During the robbery, Johnny accidentally shoots and kills the store owner. At his trial, Johnny claims that he was compelled to commit the robbery by Bill and John, who threatened to assault Johnny's sister if Johnny didn't bring them illegal booze.

A) A government witness testifies that she and Mary murdered Bob. In exchange for the testimony, the witness is assured that she will not be prosecuted for the murder; this is an example of ____ immunity.
B) transactional
C) use
D) diplomatic
E) legislative