Explanation

In bond indentures, the corporate trustee acts in a fiduciary capacity for bond investors (I only).

Key Points:

• Fiduciary duty means the trustee has a legal obligation to act in the best interests of the bondholders
• The trustee represents and protects the interests of bond investors, not the issuers, underwriters, or regulators
• The trustee's responsibilities include:
  • Ensuring the issuer complies with the bond indenture terms
  • Protecting bondholders' rights and interests
  • Taking action if the issuer defaults
  • Administering the bond issue

Why not the other options:

• II. Bond issuers: The trustee does NOT represent the issuer's interests
• III. Bond underwriters: Underwriters are involved in the initial sale but the trustee doesn't represent them
• IV. Regulators: The trustee doesn't act on behalf of regulatory authorities

The correct answer is A. I only - the corporate trustee acts in a fiduciary capacity for bond investors only.