From the Bondholder's Point of View,the Optimum Time to Convert

Multiple Choice

From the bondholder's point of view,the optimum time to convert a convertible bond is when the bond's conversion value is:

A) less than the call price,but greater than the face value.
B) greater than the call price,but less than the straight debt's value.
C) equal to the face value.
D) less than the straight debt's value,but greater than the call price.
E) greater than the both the call value and straight bond value on the call date.