Answer: it emphasizes the amount of income earned over the life of the proposal(D)
Explanation:
The average rate of return is the average yearly amount of cash flow that is generated over the life of an investment. The average rate of return rate is calculated by adding all expected cash flows and then dividing by the number of years which the investment is projected to last for.
The average rate of return allows for a easy comparison between several types of investments. The average rate of return is also easy to compute as it takes note of the amount of income that is earned over the life of the proposal.