The correct answer is: A. Tapi
The Navsari city is situated on the banks of the Tapi River. The Tapi River is a major river in the Indian state of Gujarat. It originates in the Satpura Range in Madhya Pradesh and flows through Gujarat before emptying into the Arabian Sea. The Tapi River is a major source of irrigation for the region and is also used for drinking water and industrial purposes.
The other options are incorrect. The Aji River is a river in the Indian state of Gujarat. It originates in the Girnar Hills and flows through the city of Ahmedabad before emptying into the Sabarmati River. The Purna River is a river in the Indian state of Maharashtra. It originates in the Western Ghats and flows through the city of Nashik before emptying into the Godavari River. The Sabarmati River is a river in the Indian state of Gujarat. It originates in the Aravalli Range and flows through the city of Ahmedabad before emptying into the Arabian Sea.