Which of the following barriers is typically categorized as a client barrier in community health referrals?

The correct answer highlights that stigma surrounding mental health is categorized as a client barrier in community health referrals. This is because stigma can significantly impact an individual's willingness to seek help and participate in community health initiatives. When individuals face negative perceptions or discrimination related to mental health issues, they may feel ashamed, embarrassed, or fearful of engaging with healthcare services. This barrier is particularly client-focused as it reflects the attitudes and beliefs held by individuals that directly affect their access to care.

In contrast, other barriers such as costs associated with services or lack of transportation, while significant, are more systemic in nature, relating to the healthcare system's structure or societal resources rather than the individual's personal beliefs or feelings. Inadequate knowledge of resources also points to an informational gap rather than a personal barrier derived from attitudes or stigma. Therefore, stigma around mental health stands out as a primary barrier rooted in the client’s own experience and perceptions.