Answer: I. Interest rates increase.
II. Interest rates stay the same.
III. Interest rates fall.
Explanation:
Based on the information given in the question above, the realized rate of return will be the same as the promised yield on the bond when there's an increase in the interest rates.
Also, in a situation whereby the interest rates stay the same or falls, the realized rate of return will still be the same as the promised yield on the bond.