A? b? c? d? can i get an accurate answer

The process is called cost-benefit analysis.
Cost-benefit analysis refers to the analysis that pertains to weighing benefits and costs of an action, as well as missed opportunities etc. It is usually based on number analysis and variables and it is especially suited for business and monetary endeavors.
A political calculation is related to politics, while public service means that the beneficiary is the public, not a corporation. Finally, the last choice is wrong because pro-and-con-review would do little to help us estimate the sales; it is more suitable for moral issues and other contentious issues where mathematics have little to say.

The answer is eastern europe