Hydel power accounts for 17% of the total power generation ; thermal power accounts for 80% and nuclear power only about 3%.Despite the inherent advantages and superiority of hydropower plants over thermal and nuclear plants how much of hydropotential has been used so for :

• A. Only about 80% of its potential has so far been tapped.
• B. Only about 60% of its potential has so far been tapped.
• C. Only about 40% of its potential has so far been tapped.
• D. Only about 20% of its potential has so far been tapped.