Which of the following action will decrease a bonds yield to maturity? Select one:

a. A change in the bankruptcy code makes it more difficult for bondholders to receive payments in the event the firm declares bankruptcy.

b. The bond is downgraded by the rating agencies.

c. The economy seems to be shifting from a recession to a boom.

d. The bonds price decreases.

e. Investors learn that the bonds are subordinated to another debt issue.