What Is the Purpose of a Cost-Benefit Analysis of a Public

What is the purpose of a cost-benefit analysis of a public good?

A) to document why the private sector is not supplying the good
B) to lay down rules about who will be allowed to consume the good
C) to establish whether the good is excludable
D) to decide how much of the good the government should supply
E) to determine how much consumers should pay for the good