A tradeoff exists between a clean environment and a higher level of income in that

a.

studies show that individuals with higher levels of income pollute less than low-income individuals.

b.

efforts to reduce pollution typically are not completely successful.

c.

laws that reduce pollution raise costs of production and reduce incomes.

d.

employing individuals to clean up pollution causes increases in employment and income.

Can you elobrate which is the correct answer and why?