问题如下：
When investing in the following securities, which one is most likely to lead investors to consider the credit risk:
选项：
A. RMBS backed by non-recourse loans
B. RMBS backed by recourse loans
C. MBS with call protection.
解释：
A is correct.
For non-recourse loans, the lender can only foreclose the mortgage property and use the proceeds from the sale of property to recover the outstanding mortgage balance.
综合上面几个问题，还是没有明白为什么要选a不是c
