The correct answer is B. Economic return.
Economic return is the profit derived from a project or business enterprise without consideration of obligations to financial contributors and claims of others based on profit. It is the difference between the total revenue generated by a project or business and the total costs incurred.
Yield is the amount of a crop or product that is produced from a given area of land or a given number of animals.
Earning value is the present value of the future earnings of an asset.
Gain is an increase in wealth or assets.