Which One of the Following Statements Is True

Which one of the following statements is true?

A) The interest risk premium always adds a downward bias to the slope of the yield curve.
B) The longer the maturity of a security,the greater its interest rate risk.
C) If investors believe inflation will be subsiding in the future,the prevailing yield will be upward sloping.
D) The real rate of interest varies with the business cycle,with the lowest rates seen at the end of a period of business expansion and the lowest at the bottom of a recession.