Answer: B. state constitution
Explanation: The creation of state courts is outlined in the state constitution. Each state has its own constitution, which serves as the highest legal document within that state and varies state by state within the US. Furthermore, the state constitution establishes the structure and powers of the state government, including the judiciary, provides the framework for the creation of state courts, and defines their jurisdiction, powers, and procedures.
State courts are an essential part of the judicial system in the United States as they handle a wide range of cases, including criminal, family, civil, and probate matters. State courts have the authority to interpret and apply state laws within their respective jurisdictions.