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 Macaulay duration is correct?
Option A:A bond’s coupon rate and Macaulay duration are positively related.
Option B:A bond’s Macaulay duration is inversely related to its yield-to-maturity.
Option C:The Macaulay duration of a zero-coupon bond is less than its time-to-maturity.

Answer: B