Which of the Following Duration Analysis Is Incorrect

Which of the following duration analysis is incorrect?

A) Duration can be used to calculate the dollar value impact of an interest rate change on the value of a security.
B) The duration of a portfolio is the weighted duration of each asset or liability in the portfolio.
C) A longer term bond with a higher duration than a short-term bond is faced with higher interest rate risk.
D) Duration analysis assumes that yield curves are normal or upward sloping.