Final answer:
The subject of this question is Social Studies. The appropriate answer is an elected official or representative.
Step-by-step explanation:
The subject of this question is Social Studies and the grade level is High School.
The passage provided does not explicitly mention the specific role or title of the person responsible for receiving and addressing complaints from citizens regarding a department. However, based on the context, it can be inferred that this responsibility falls under the domain of an elected official or representative.
In the passage, it states that regardless of whether representatives adopt a delegate or a trustee mentality, they see it as their duty to address the concerns and needs of the people they represent. They will typically help constituents who need assistance or have problems with the government. Therefore, the appropriate answer to the question is an elected official or representative.