The correct answer is Ravi because it's the only option that is an actual river. The Ravi is a major river in Pakistan and India, one of the five rivers of the Punjab region. The other options (Ram, Raghu, and Raja) are not geographical features - they are common Sanskrit/Indian names, with 'Raja' meaning 'king' and 'Ram' being a major Hindu deity, making them clearly incorrect options in a question about rivers.