About 20% of the world's population has no electric lighting. These households usually rely on kerosene lamps, which generate large amounts of C02 emissions. The lamps also cause indoor air pollution which leads to serious breathing problems. Installing solar lamps to replace kerosene lamps can be seen as an example of pollution reducing abatement. Taking the preceding as given, which of the follow is true? Group of answer choices The socially optimal level of abatement would be zero if the private marginal benefit is equal to the private marginal cost. The private marginal cost of abatement is positive because respiratory illnesses lower productivity. The social marginal benefit of abatement includes the reduction in breathing problems and the reduction in CO2. All of these responses are true