Answer:
Option A and C are examples of assault.
Explanation: According to Wikipedia "An assault is the act of inflicting physical harm or unwanted physical contact upon a person or, in some specific legal definitions, a threat or attempt to commit such an action. It is both a crime and a tort and, therefore, may result in either criminal and/or civil liability."
In option A although there was no physical contact, the gun brought out counts as an assault to the life of Ruby.
In B, though there is a threat there is no contact at the moment of incidence so it's not an assault.
In option C, there is a physical contact as the gun was shot so it definitely an assault.