Final answer:
Without context, one can assume that option (c). Consumer' is the correct answer, as consumer complaints are typically prioritized by commissions to protect public safety and fairness.
Step-by-step explanation:
The question refers to the policies and procedures adopted by a commission, likely within a regulatory or governmental body, which establishes the precedence for investigating complaints. It is typically understood that certain complainants may be given priority, depending on the commission's mandate and the nature of the complaint.
Without specific context, it is difficult to provide one definitive answer; however, if we assume that the commission aims to protect the public interest, then the answer is likely C. Consumer as consumer complaints often directly relate to public safety, fairness, and welfare concerns.
State employees, commission members, and brokers might also be involved with complaints, but consumer complaints are usually seen as a higher priority in many regulatory contexts.