Concept:A "deterrent" means something that prevents or discourages an action.Explanation:The underlined word "deterrent" is used to describe something meant to stop indiscipline by creating fear or hesitation.Among the options, "discouragement" best conveys this idea of making someone less willing to misbehave."Remedy" is a cure, "measure" is a general step, and "prevention" goes beyond discouraging to fully stopping the action.Answer:C. discouragement