A conflict has arisen over the use of the Yat River between commercial fishermen, who have traditionally caught large quantities of salmon in the river, and a large producer of chemicals, who has begun to dispose of wastes by dumping them into the river.The large amount of wastes being dumped is killing a large number of fish.For simplicity, assume no other benefits (for instance, scenic) are derived from the river.If the government wants to promote efficient resource use, which of the following policies would be most appropriate in this case?It should:

a.prohibit the chemical producer from dumping wastes into the river.

b.encourage fishermen to fish elsewhere and compensate them for any loss in income.

c.follow laissez faire principles, and let the free market's "invisible hand" determine river use.

d.allow the chemical producer to dump wastes into the river but charge the firm for the decrease in value of

the river as a fishery.