What term refers to the act of killing for profit?

The term "killing for profit" specifically refers to actions taken with the intent to gain financial or material rewards from the act of murder. This notion is often associated with organized crime, where individuals or groups may commit homicide as a means of eliminating competition, settling debts, or enforcing control over illegal enterprises. The motive here is ultimately financial gain rather than personal satisfaction, vengeance, or self-defense.

In contrast, the other options suggest motivations that are more personal or emotional in nature, such as revenge, pleasure, or protection. Those concepts do not encapsulate the financial motivation that "killing for profit" conveys, making it the most accurate choice for this question.