One Night,Bertram Discovers Clu,an Intruder,in Bertram's Deli Delite Store After

One night,Bertram discovers Clu,an intruder,in Bertram's Deli Delite store after the store is closed.Bertram shoots and kills Clu.With respect to criminal prosecution for this use of deadly force,under a duty-to-retreat law Bertram

A) is presumed innocent or may be exempt from prosecution.
B) must prove that he first told Clu to "Get out!" or to "Retreat!"
C) must prove that he first tried to retreat or that his life was in danger.
D) must prove that Clu did not try to retreat or acted without regard for his own life.