Cost benefit analysis don't involve tax paying.
What is cost-benefit analysis?
It is a process/analysis which the business undertakes before taking up of a new project by comparing the estimated cost and benefits from a project. If the benefits from the project is more than cost, incurred in for the project, it is selected.
Paying taxes is not a step of cost benefit analysis.
Therefore, it can be said that option C is not a step involved in cost-benefit analysis
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