Hint: Dhauliganga project is a multi-purpose river valley project; it is an earth-fill embankment and concrete face rock dam built on the River Dhauliganga. It is a run of the river scheme with small pondage to harness the hydropower potential of the Dhauliganga River.
Complete step-by-step solution:
The archaeological and historical records show that sophisticated hydraulic structures like dams built of stone rubble, reservoirs or lakes, embankments, and canals for irrigation, have been constructed from ancient times. This tradition has continued over the years in modern India by building dams in most of the river basins. Dams were traditionally built to impound rivers that could be used later to irrigate agricultural fields. But at present dams are built not just for irrigation purposes but also for producing electricity, flood control, water supply for domestic and industrial uses, recreation, fish breeding, and inland navigation. This is why dams are referred to as multi-purpose projects since they serve so many purposes. The Dhauliganga Dam is located in the Pithoragarh district of Uttarakhand. The project comprises 56 m high, 270 m long with a $6.5$ m diameter concrete faced rockfill dam. The underground power station near Alagad houses 4 units with an installed capacity of 280 MW, i.e., 70 MW each. They are designed to operate under the rated head of 297 m and to generate $1134.69$ million units in a $90\% $dependable year with $95\% $ machine availability.
Thus, option (A) is correct.
Note: This dam was constructed and operated by a joint venture of HCC and Daewoo Engineering & construction with Bauer Maschinen and Kajima Construction Corporation limited.