Which of the following is a sign of physical abuse?

Bruises are a significant indicator of physical abuse because they are often a direct result of forceful contact that can lead to injuries. In the context of investigating potential signs of abuse, the presence of unexplained bruises or marks, especially in areas of the body that are usually covered by clothing, can raise concerns and should prompt further evaluation of the individual's situation. These physical signs may indicate a pattern of abusive behavior where an individual is being harmed intentionally by another person.

In contrast, excited behavior, frequent personal hygiene, and a calm demeanor do not typically correlate with physical abuse. Excited behavior can be a normal emotional response and does not indicate harm, while maintaining good personal hygiene may reflect self-care or may be a response to coping strategies. A calm demeanor can also be a normal behavior and may not give any indication of abuse. Therefore, bruises stand out as a clear and concerning sign requiring attention and investigation.