为什么Long put options hedge against rising interest rates

问题如下：

Franco’s description of the Black model’s approach to valuation of Eurodollar futures options used for hedging is:

选项：

A.correct. B.incorrect, because he is describing a call option. C.incorrect, because he is describing a put option.

解释：

B Correct. Franco is incorrect because he describes a long call option, which according to the Black model can be viewed as the futures component minus the bond component. Long put options hedge against rising interest rates. The Black model evaluates put options as the bond component minus the futures component.