Under Missouri law, what characterizes "assault in the first degree"?

Under Missouri law, "assault in the first degree" is characterized by actions that involve either attempting to kill another person or causing serious physical injury to someone. This definition highlights the severity and intention behind the act, as first-degree assault is considered a serious crime that reflects a deliberate intent to inflict substantial harm or take a life. The emphasis on causing serious physical injury or making an attempt on someone's life distinguishes this level of assault from lesser degrees, which may deal with threats, minor injuries, or actions without the intent to cause significant harm. Thus, the correct answer encapsulates the most critical elements of the crime as defined by Missouri statutes, focusing on the gravity of the offense.