If B is threatening A with a revolver, can A shoot B in self-defense?

A can shoot B in self-defense if A is in imminent danger. The key concept in self-defense claims is the requirement of imminent threat. In this scenario, B is threatening A with a revolver, which typically indicates that A is facing an immediate risk of harm. A is justified in using reasonable force to protect themselves when confronted with such a threat.

The concept of imminent danger includes the perception of an immediate risk to one's safety that warrants a defensive response. If B's threat is reasonable and presents a clear, immediate danger to A, A's response of using force, in this case shooting, can be considered legally justifiable.

The other options suggest alternative actions or conditions that may not necessarily apply in this context. For example, fleeing might not always be a viable option when faced with an immediate and lethal threat, nor should one have to wait for an actual physical attack when the threat itself is severe enough to warrant immediate defensive action. Therefore, A's right to defend themselves is grounded in the legitimacy of the imminent danger posed by B's threats.