问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
C为什么错？ 不是说当抵押品按照他独定的价格进行偿付的时候会产生交易费用吗？
NO.PZ2016082405000052 Collateragreements coulpotentially create multiple risks, inclung liquity anliquition risks. Whiof the following is most accurate regarng liquity anliquition risk? Liquition risk occurs when the amount of a security solis large relative to its outstanng volume, whimaffethe priof thsecurity. Liquity risk must heein spot anforwarmarkets. Liquition risk emboes a transaction cost when collateris liquitein accornwith inpennt amount. Liquity risk occurs when there are potentipitfalls in the haning of collateral, inclung humerror. A Liquiting a security in amount this large relative to its typictrang volume mnegatively impaits price, leang to a substantiloss. 请问老师，这两个概念具体是在哪里讲的？
Collateragreements coulpotentially create multiple risks, inclung liquity anliquition risks. Whiof the following is most accurate regarng liquity anliquition risk? Liquition risk occurs when the amount of a security solis large relative to its outstanng volume, whimaffethe priof thsecurity. Liquity risk must heein spot anforwarmarkets. Liquition risk emboes a transaction cost when collateris liquitein accornwith inpennt amount. Liquity risk occurs when there are potentipitfalls in the haning of collateral, inclung humerror. A Liquiting a security in amount this large relative to its typictrang volume mnegatively impaits price, leang to a substantiloss. 操作风险么？
老师好，A，为什么当amount of security solis large relative to its outstanng volume的时候，会对价格有negative的影响？是因为市场上突然出现大量的这个security，类似供给增加，会导致价格下降吗？
老师 c为什么不对
