Concept:A system where elected officials govern on behalf of the people and are held responsible by voters is called a representative government.
Explanation:People choose their lawmakers through elections.
These lawmakers act for the citizens and must answer for their decisions and actions.
If the officials perform poorly, the people can vote them out in the next election.
This makes the lawmakers directly accountable to the electorate.
Other options do not match this idea: first-past-the-post is an electoral method, oligarchy is rule by a small group, and checks and balances refers to limiting government power among branches.
Answer:A. a representative government