Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Which of the following statements about duration is correct? A bond’s:
Option A:effective duration is a measure of yield duration.
Option B:modified duration is a measure of curve duration.
Option C:modified duration cannot be larger than its Macaulay duration (assuming a positive yield-to-maturity).

Answer: C