Which of the Following Could Be a Sensible Reason for Issuing

Which of the following could be a sensible reason for issuing convertibles?

A) Convertibles are convenient and flexible - they're usually unsecured and subordinated, and cash requirements for debt service are relatively low
B) Interest rates on convertible issues are significantly less than on straight debt
C) Firms that need equity capital use convertibles as a roundabout way of issuing stock
D) Firms prefer to issue convertibles when their shares are under-valued