Which of the Following Are Characteristics of Tradeable Pollution Permits

Multiple Choice

Which of the following are characteristics of tradeable pollution permits?
(i) they are a scarce resource
(ii) they can be traded in a market governed by supply and demand
(iii) they eventually lead to an efficient elimination of all pollution

A) (i) , (ii) and (iii)
B) (iii) only
C) (i) and (iii) only
D) (i) and (ii) only