The longest River of Peninsular River is:

Answer: (4) Godavari

Explanation:

The Godavari River is the longest Peninsular River in India and the second longest river in India, with a length of 1,464 km. It originates from the Trimbak (Triambakeshwar) region near Nashik in Maharashtra and flows through Chhattisgarh, Telangana, and Andhra Pradesh before draining into the Bay of Bengal. 

Among the Peninsular Rivers of India, the Godavari is the largest river system by length. Its important left-bank tributaries include Banganga, Kadva, Shivana, and Purna, while the right-bank tributaries are Nasardi, Darna, and Pravara. The river plays a significant role in agriculture, irrigation, regional economy, and river-based ecosystems across Peninsular India.

About Other Options:

(a) Mahanadi: The Mahanadi River is 890 km long and is the eighth longest river in India. It originates in Chhattisgarh and drains into the Bay of Bengal. The Hirakud Dam on the Mahanadi provides flood control and water regulation.

(b) Tapti (Tapi): The Tapti River is 724 km long and is the tenth longest river in India. It originates from the Satpura Range in Madhya Pradesh and flows westward into the Arabian Sea through Maharashtra and Gujarat.

(c) Narmada: The Narmada River is 1,312 km long and is the fifth longest river in India. It originates from the Amarkantak Plateau in Madhya Pradesh and flows westward into the Arabian Sea. It is widely known as the Lifeline of Madhya Pradesh and Gujarat.

Additional Information:

• Ganga is the longest river in India, covering 2,525 km, and originates from the Gangotri Glacier before flowing into the Bay of Bengal.
• Krishna is the third longest river in India with a length of 1,400 km, followed by the Yamuna at 1,376 km.