问题如下：
Which of the following descriptions regarding collateralized mortgage obligations (CMOs) is most accurate?
选项：
A. CMO can change the prepayment risk.
B. CMO has a unique structure.
C. CMO broadens the appeal of mortgage-backed products.
解释：
C is correct.
The creation of CMO cannot eliminate or change the prepayment risk, but can only distribute the various forms of this risk among different bond classes. CMOs have a wide range of structures. CMO meets the assets/liability needs of institutional investors, thereby boardening the appeal of the mortgage-backed products.
老师，CMO有很多结构，比如有哪些呢
同学你好，