Which of the following statements is correct?

A) The capital gains yield from buying treasury bonds is always positive.

B) The rate of return from buying a corporate bond will be equal to its coupon rate as long as the bond does not default.

C) The rate of return from buying a treasury bond will be equal to its coupon rate as long as investors don't sell the bond prematurely.

D) The current yield of a treasury or corporate bond can not be negative.

E) None of the above is correct.