Assume that a projects cash flows are represented by a series A, and its salvage values by a series B, running over the physical life of the project. In calculating the optimal economic life of a project, one must construct a new series of cash flows by

A) adding A and B for each year of the physical life of the project

B) taking B until the year before termination and adding A and B in the year of termination

C) subtracting B from A for each year of the physical life of the project

D) adding A and B until the year before termination and B alone in the year of termination

E) taking A until the year before termination and adding A and B in the year of termination