Opportunity cost refers to the value of the next best alternative that is given up when a choice is made. In engineering economics, opportunity cost is crucial in evaluating investment decisions, as it helps engineers and managers consider the trade-offs between different options.

Benefit-cost analysis is a method used to evaluate the economic viability of a project or investment by comparing its benefits and costs.

The PV of Option B is:

7 Principles of Engineering Economics with Examples**