Final answer:
Being spanked as a child (C) is a risk factor for developing violent behavior because it can foster learning aggressive behaviors that might carry into adulthood.
Step-by-step explanation:
A community health nurse assessing clients for risk factors of violent behavior should identify being spanked as a child (C) as a risk factor for developing violent behavior. This type of childhood experience, which involves physical punishment, can be associated with learning aggressive behaviors and perpetuating a cycle of violence into adulthood. Research has indicated that a history of being mistreated as a child can lead to a higher risk of developing violent behavior later in life.
In contrast, being praised for good behavior (A), having supportive family relationships (B), and participation in community activities (D) are generally considered factors that can contribute to positive development and are not associated with increasing the risk of violent behavior.