Generally,we Accept That Lethal Force Is Morally Acceptable in Self-Defense

Generally,we accept that lethal force is morally acceptable in self-defense or to protect another from a threat to their life.According to Miller,in what circumstances is police use of lethal force morally justified?

A) to keep public order in case of riots,looting,or community violence
B) to uphold the law
C) when there a breakdown of public order
D) all of these