which of the following reform measures could voters use against a mayor they oppose? a recall an impeachment…

Answer:

A. a recall

Brief Explanations:

A recall is a reform measure that allows voters to remove an elected official (like a mayor) from office before their term ends. Impeachment is usually for higher - level officials (like presidents in some systems) and has a more formal, legislative process. A referendum is about voting on a specific issue or law. An initiative is a way for citizens to propose new laws. So, a recall is the appropriate measure against a mayor.