which answer best describes the intuition behind the fact that the present value of a stream of cash flows is just the sum of the present values of each individual cash flow?

A future cash flow's present value represents the amount you would need to invest today to receive an equivalent cash flow at the same future point in time.
		Investment is risky so therefore giving up capital today demands a price be paid at some future point
		Only cash flows that occur at the same time period can be compared, added, or subtracted unless one cash flow is discounted to its present value.
		algebra is important