Concept:Operation Prahar is a special enforcement drive by Bihar Police to strictly enforce the state's liquor ban law.Explanation:Bihar Police launched Operation Prahar to catch people violating the prohibition (liquor ban) law.Under this operation, anyone found drinking or under the influence of alcohol is immediately arrested and produced before an Executive Magistrate.If bulk liquor is recovered from a temporary place, that place can be demolished by the Collector's order.The operation focuses on strict action against violators and does not allow any easy escape from fines or penalties.Answer:C. liquor ban