问题如下图：气球风险是什么风险，能在具体解释一下吗？
选项：
A. 
B. 
C. 
解释：
NO.PZ2018062012000013 看不懂
The lenr cinitiate a claim against borrower for the shortfall after sale of collerateproperty. Balloon risk cannot avoiin CMBS. B is correct. In a CMBS, if the borrower faults, the lenr cextenthe loover a perioof time calle\"workout perio" anmofy the originterms of the loancharge a higher interest rate, calle\"fault interest rate\", ring the work perio In non-recourse CMBS, lenr hno further claims apart from sale of collerateproperty. A是什么意思能下吗？
老师，可以麻烦在这题的B嘛？谢谢
气球风险是不能避免的吗？谢谢老师
