Concept:Onam is the harvest festival of Kerala, celebrating the homecoming of King Mahabali.Explanation:Onam is celebrated during the Malayalam month of Chingam (August-September). It is deeply rooted in Kerala's culture with traditional feasts, floral designs, boat races, and dances. The festival is recognized as the state festival of Kerala and is celebrated by all communities, symbolizing unity and harmony.Answer:C. Kerala