Which of the following statements concerning the effects of interest rate volatility on bonds with embedded options is FALSE（）

A. As yield volatility increases, the value of callable bonds decreases.

B. A putable bond’s value is its straight bond value plus the value of the embedded put option.

C. A callable bond’s value is its straight bond value plus the value of the embedded call option.

溶组织内阿米巴的生活史过程是

A．双核包囊→滋养体→双核包囊

B．单核包囊→滋养体→双核包囊

C．四核包囊→滋养体→单核包囊

D．四核包囊→滋养体→四核包囊

E．单核包囊→滋养体→单核包囊