Which of the Following Statements Is Correct with Respect to Bonds

Which of the following statements is correct with respect to bonds?

A) Nearly all secondary trading of bonds occurs in the over-the-counter market.
B) Over the years,bonds have become steadily less important as a source of long-term funds for corporations.
C) From an investor's perspective,debentures are generally a better investment than bearer bonds.
D) When an investor hears that a bond has a sinking fund,that is a sign that the company is in financial trouble.
E) All of these statements are correct.