The correct answer is option 2, Rajasthan. The Narmada River is one of the major rivers in central India and flows through multiple states. The other options listed, Madhya Pradesh, Gujarat, and Maharashtra, are all states that are part of the Narmada River basin. Madhya Pradesh is the largest state in terms of the Narmada River basin, as it originates from Amarkantak in the state. The river then flows through Gujarat and Maharashtra before emptying into the Arabian Sea. However, Rajasthan is not part of the Narmada River basin. It is important to note that rivers often traverse multiple states, and understanding the basin boundaries helps in understanding the geographical distribution of water resources.