Answer:
The correct answer is letter "D": deferred call.
Step-by-step explanation:
While talking about bonds, a deferred call represents a restriction that companies issuing bonds have to call the bond before a certain date. Deferred calls guarantee receipts of payment during the time it lasts and stability, but ties the company's hands by making payments to bondholders during the same time. In some cases, bonds with deferred calls have lower interest rates.