问题如下图：
选项：
A. 
B. 
C. 
解释：
没理解c的意思，appeal不是上诉吗
CMO ha unique structure. CMO broans the appeof mortgage-backeprocts. C is correct. The creation of CMO cannot eliminate or change the prepayment risk, but conly stribute the various forms of this risk among fferent bonclasses. CMOs have a wi range of structures. CMO meets the assets/liability nee of institutioninvestors, thereboarning the appeof the mortgage-backeprocts. 老师，CMO有很多结构，比如有哪些呢
a为什么不对，改变结构也是change啊，并没有说消除prepayment risk
老师，对于B项的理解，答案讲解感觉把“unique” 这个词当成了“单一的”来理解的，是么？
