NO.PZ2024021803000003
问题如下：
Which of the following factors has a positive effect on the value of a European put option?
选项：
A.Risk-free rate.
B.Exercise price.
C.Underlying asset value.
解释：
The value of a European put option is mainly influenced by its exercise price. A higher exercise price generally increases a put option's value. 欧式看跌期权的价值受其行权价格的影响，较高的行权价格通常会增加看跌期权的价值。A为什么不对，不理解
