Spreading rumors behind someone's back can most appropriately be referred to as:

Correct option is C

• Indirect aggression refers to behaviors aimed at harming someone without direct confrontation. This includes spreading rumors, gossiping, or excluding someone socially.
• Such actions are covert, making them harder to detect, and are often used to damage a person’s reputation or relationships.

Additional Information:

• (1) Social aggression: Although similar, social aggression is broader and includes overt actions such as verbal abuse or public humiliation.
• (2) Relational aggression: Focuses specifically on damaging or manipulating relationships, which can include indirect aggression but is not limited to it.
• (4) Physical aggression: Involves direct physical harm, such as hitting or pushing, which does not apply to spreading rumors.