The correct answer is D. All of the above.
Baira Siul, Chamera-I, and Chamera-II are all hydro power projects that are related to the Ravi river.
Baira Siul is a 420 MW hydroelectric power project located on the Ravi river in the Chamba district of Himachal Pradesh, India. The project was commissioned in 2003.
Chamera-I is a 300 MW hydroelectric power project located on the Ravi river in the Chamba district of Himachal Pradesh, India. The project was commissioned in 1988.
Chamera-II is a 330 MW hydroelectric power project located on the Ravi river in the Chamba district of Himachal Pradesh, India. The project was commissioned in 2003.
These three projects are all important sources of electricity for India. They also provide employment and other benefits to the local communities.