A、non-CAllABlE BonD with 18 yEArs rEmAining mAturity hAs An AnnuAl Coupon oF 7 pErCEnt AnD A $1000 pAr vAluE. thE CurrEnt yiElD to mAturity on thE BonD is 8 pErCEnt. whiCh oF thE Following is ClosEst to thE EFFECtivE DurAtion oF thE BonD
A．

A、9.63.

B．

B、11.89.

C．

C、8.24.