What is the WIC section that addresses a situation where a sibling of a minor has been abused and poses a risk to that minor?

The correct choice, which refers to WIC section 300j, is focused on the situation where a sibling of a minor has been abused and subsequently poses a risk to that minor. This section of the Welfare and Institutions Code (WIC) is specifically designed to address cases where there's a concern about sibling abuse or the potential for further harm to the minor due to familial circumstances. It emphasizes the importance of protecting minors from exposure to environments where abuse has occurred, particularly when related individuals could pose a risk.

In contrast, other sections mentioned do not specifically address this unique situation. For example, WIC 305 pertains to the dependency process and children's welfare in broader terms without focusing primarily on sibling-related abuse scenarios. WIC 601b deals with status offenders, such as runaways, while WIC 602 focuses on juvenile delinquency, neither of which encompasses the issues related to sibling abuse and risks sufficiently.

Thus, WIC section 300j is critical for understanding and providing the necessary protections for minors who may be at risk due to the actions or history of abuse of their siblings, highlighting the legal framework in place to ensure their safety.