Which of the Following Statements Is Correct

Multiple Choice

Which of the following statements is correct?

A) Because a clean environment is a public good, a feasible goal is to eliminate all pollution, regardless of the cost.
B) Rich countries usually have cleaner environments than poor countries because a clean environment is like other normal goods in that it has a positive income elasticity.
C) Clean water and clean air are priceless goods.
D) All of the above are correct.