The correct answer is b) Hydroelectric potential.
The Periyar River is a river in the Indian state of Kerala. It is the third longest river in Kerala, after the Bharathappuzha and the Pamba. The Periyar River is known for its hydroelectric potential. The Periyar Hydroelectric Project is a major hydroelectric project on the Periyar River. The project was commissioned in 1980 and has a capacity of 300 MW. The Periyar River is also a popular tourist destination. The Periyar Tiger Reserve is located on the banks of the Periyar River. The reserve is home to a variety of wildlife, including tigers, elephants, and leopards.
The other options are incorrect.
a) Length: The Periyar River is 244 kilometers long. It is the third longest river in Kerala, after the Bharathappuzha and the Pamba.
c) Irrigation significance: The Periyar River is an important source of irrigation for the state of Kerala. The river irrigates over 100,000 hectares of land.
d) Religious importance: The Periyar River is not a religious river.