The correct answer is:
d. Because of the differences in tax treatment and credit risk, the corporate bond should have the higher interest rate.
Explanation: Generally, corporate bonds carry higher credit risk compared to government bonds, which are considered safer investments (especially state and local government bonds due to their low probability of default). As a result, investors will demand a higher interest rate (yield) for taking on the additional risk associated with the corporate bond. Additionally, many state government bonds offer tax advantages (such as being exempt from federal taxes), which can make them more attractive and lead to lower interest rates compared to corporate bonds. Thus, given these factors, the corporate bond is expected to have a higher interest rate.