What type of representation holds representatives accountable to their constituents?

Agency representation is the correct choice because it refers to a system where elected representatives act as agents for their constituents, primarily being accountable for their actions and decisions through regular elections. In this model, representatives are expected to prioritize the interests and preferences of the people who elected them. This establishes a direct connection and responsibility between constituents and their representatives, ensuring that the representatives are responsive to the needs of their electorate.

In contrast, delegate representation emphasizes that representatives should directly reflect the opinions and choices of their constituents, possibly without their own judgment influencing decisions. Trustee representation allows representatives to act according to their own judgment, assuming they are making decisions in the best interest of their constituents, but this may not guarantee accountability. Constituency representation is a broader term that generally includes various forms of representation without specifying mechanisms of accountability.

Thus, agency representation distinctly emphasizes the accountability of representatives to their constituents, reinforcing a system of checks through electoral processes.