Why Is It Usually Necessary to Use the Time Value

Why is it usually necessary to use the time value of money when performing a cost-benefit analysis?

A) For an investment project to be considered, costs must have a higher dollar value from benefits.
B) Although costs and benefits generally occur concurrently, the benefits will accrue value over time, due to interest.
C) In most investment projects costs are incurred up front, but benefits are provided in the future.
D) For practical purposes, a dollar today may be considered to be equal to a dollar at some future time.