The correct answer is option 'A' - Rupnarayan.

The Rupnarayan River is one of the major rivers in West Bengal, India, which flows through the districts of Purulia, Bankura, Paschim Medinipur, and Howrah. It eventually enters the state of Odisha (formerly known as Orissa) from West Bengal.

Here is a detailed explanation:

Heading: Rupnarayan River

The Rupnarayan River originates from the Chota Nagpur Plateau in West Bengal. It is formed by the confluence of two rivers - Dwarakeshwar and Silai. The river flows in a southerly direction and passes through the districts of Purulia, Bankura, Paschim Medinipur, and Howrah in West Bengal.

Heading: Entry into Odisha

The Rupnarayan River enters the state of Odisha (Orissa) after flowing through West Bengal. It serves as a natural boundary between the two states. Once it enters Odisha, the river continues its flow and eventually joins the Bay of Bengal.

Heading: Importance and Significance

The Rupnarayan River is of great importance to both West Bengal and Odisha. It serves as a lifeline for the people living in the regions through which it passes. The river provides water for irrigation, drinking, and various other purposes. It also supports agricultural activities in the surrounding areas.

The river is also a significant waterway for transportation. It facilitates the movement of goods and people between different towns and cities along its course. Several bridges and ferry services are available to cross the river and connect the regions on either side.

Heading: Conclusion

In conclusion, the Rupnarayan River enters Odisha from West Bengal. It is an important river that provides various benefits to the regions it passes through. Its entry into Odisha marks the continuation of its journey towards the Bay of Bengal.