Final answer:
The cash flow stream from the small business venture is a growing perpetuity, as it increases by 15% every year for the next 25 years.
Step-by-step explanation:
In this case, the cash flows from the small business venture are increasing by 15 percent every year for the next 25 years. This type of cash flow stream is called a growing perpetuity.
A growing perpetuity is a series of cash flows that grow at a constant rate indefinitely. It is similar to a regular perpetuity, which is a series of cash flows that continue indefinitely at a constant rate, but with the added feature of growth.
So, the correct answer is B) a growing perpetuity.