On which river is the Koldam Hydro Power Plant with Soviet collabaration?

The correct answer is: A. Sutlej

The Koldam Hydro Power Plant is a run-of-the-river hydroelectric power plant on the Sutlej River in Himachal Pradesh, India. It is the largest hydroelectric power plant in India, with an installed capacity of 2,400 MW. The plant was built with Soviet collaboration and was commissioned in 1998.

The other options are incorrect because:

• The Ravi River is a tributary of the Chenab River.
• The Chenab River is a tributary of the Indus River.
• The Beas River is a tributary of the Sutlej River.