Verbal Aptitude

Proposal: 'A state should replace all diesel agricultural pumps with solar photovoltaic pumps under a 90% capital subsidy scheme.' Which question is most vital to evaluate the long-term impact on groundwater sustainability?

Options:

• (A) Whether the zero marginal operating cost of solar pumps will encourage farmers to pump water continuously, accelerating groundwater overdraft.
• (B) Whether solar photovoltaic panels produce direct current or alternating current.
• (C) Whether diesel engines produce more exhaust smoke than tractors.
• (D) Whether pump impellers are cast from bronze or cast iron.