The Option Adjusted Duration Will Approach the Duration to Maturity

Multiple Choice

The option adjusted duration will approach the duration to maturity, when

A) interest rates are significantly above the coupon rate because the option has very little chance of being called, and the call option will have very little value.
B) interest rates are significantly below the coupon rate because the option has very little chance of being called, and the call option will have very little value.
C) interest rates are significantly above the coupon rate because the option has a high chance of being called, and the call option will have significant value.
D) interest rates are significantly below the coupon rate because the option has a high chance of being called, and the call option will have significant value.
E) None of these are correct.