Passage (Questions 96-100)
Rainwater harvesting, once a common practice in Indian villages, is returning to the cities. Roof-top systems collect rain that would otherwise run into drains and store it in tanks or let it percolate underground, raising the water table. Although the initial cost is modest, many households ignore the idea, believing that the municipal supply will always remain adequate. Experts warn that this belief is dangerously optimistic: groundwater levels in several metropolitan areas have fallen by many metres in a decade. They urge that harvesting be made compulsory for new buildings, with penalties for non-compliance, rather than left to goodwill alone.
Which of the following can be inferred from the last sentence of the passage?
- AExperts think goodwill alone is sufficient.
- BPenalties for non-compliance already exist for all buildings.
- CHarvesting is already compulsory in every city.
- DVoluntary action alone is unlikely to spread harvesting widely.
Correct answer: D