Which of the following is a disadvantage of Cost Benefit Analysis?

The correct answer is Option (4) → Subjectivity while performing analysis

Cost benefit analysis requires that every impact be given a money value, but environmental goods such as clean air, a scenic river or an endangered species have no market price. The analyst has to assign one, and that subjective valuation — along with the choice of discount rate — can be manipulated to favour a preferred outcome.

The other three options are the recognised advantages of the technique: it is simple to grasp, it supports clear decision making, and it forces planners to lay out all the factors that affect a project.