ENERGY CLASSIFICATION AND ENERGY NEEDS IN INDIA

A: Option A tracks the chain correctly: electricity is secondary energy and its short-run elasticity is set by primary fuel availability and plant mix. With coal flat, higher demand pushes dispatch up the merit order, raising marginal cost and prices. B feels intuitive if you think in inventory terms, but stockpiles shrink when demand outpaces supply. C imports do rise over time, yet transport fuel doesn't substitute for grid power at scale. D mixes up cause and effect — frequency issues come from imbalance, not renewables backing off under demand growth.

A: Multiply 1,300 kWh by 1.4×10^9 people and you land near 1.8×10^12 kWh, or 1,800 TWh. B drops a decimal by assuming losses add an order of magnitude — they don't. C forgets that per capita already averages across all uses, including industry. D mixes annual energy with peak power logic, a common unit-basis slip.

A: A fits Indian operating reality: ash chemistry plus sulphur leads to low-melting-point deposits and accelerated metal loss. B is real in condensers, not waterwalls. C sounds severe but doesn't align with boiler metallurgy and conditions. D exists everywhere, yet it doesn't explain the accelerated wastage seen with ash-laden coal.

A: Solar removes combustion-related hazards, so C and D drop out. B is an economic exposure rather than a physical hazard. A remains: high-voltage DC arcs are stubborn and behave differently from AC, so the risk persists even in renewable installations.