Answer:
The correct answer is B. 5.45%.
The rate of return built into the annuity is equal to the present value of the annuity divided by the initial amount, $3,000,000.
The present value of an annuity can be calculated using the formula PV = PMT [(1 - (1 / (1 + i)^n)) / i], where PMT is the payment amount, i is the rate of return, and n is the number of payments.
In this case, the PMT is $250,000, i is 5.45%, and n is 20, yielding a present value of $3,000,000.
Therefore, the rate of return is 5.45%.