Which of the following bond obligations from the same company would have the highest required yield?
A. a callable bond when the implied volatility of T-bond futures options is low
B. A callable bond when the implied volatility of T-bond futures options is high
C. a putable bond
D. a convertible bond when the implied volatility of the underlying stock is high
E. a convertible bond when the implied volatility of the underlying stock is low
F. a non-callable straight bond with a bloomberg stock model value greater than the stock market price
G. a non-callable straight bond with a bloomberg stock model value greater than the stock market price