Why Is Cost-Benefit Analysis Such a Difficult Job

Multiple Choice

Why is cost-benefit analysis such a difficult job?
(i) there is no price with which to judge the value of a public good
(ii) surveys are often biased and unreliable
(iii) it is difficult to identify all factors that influence costs and benefits of public goods

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