投资者买入一份看跌期权，若期权费为C，执行价格为X，则当标的资产价格为（ ）时，该投资者不赔不赚。

(单选题)We have been hearing ( ) accounts of your work. (单选题)Don’t throw away pens and erasers ( ) you haven’t used up (单选题)I don’t like ( ) bills but when I do get them I like ( (单选题)In his plays Shakespeare ( ) his characters live through (单选题)Intellect is to the mind ( ) sight is to the body. (单选题)The first two stages in the development of civilized man wer (单选题)It can be inferred from the last paragraph that auto compani (单选题)Who does the author think should have addressed the problem? (单选题)The author believes that the extension of London's Ulez will (单选题)Which is considered a weakness of the city-level measures to