Which of the Following Statements Is NOT True

Which of the following statements is NOT true?

A) For investors,bond yields and hence prices can change dramatically over time.
B) Firms may face different costs over time,i.e.,varying yields,when issuing bonds.
C) The relative cost of issuing short-term bonds (such as those with a one-year maturity) versus long-term bonds (such as those with a thirty-year maturity) may change over time.
D) All of the statements above are true.