问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
为什么不选d，burnout也会使得prepayment变少啊
Whiof the following factors is least likely to influenthe level of resintimortgage prepayments? Seasonality. Inflation. Housing prices. Age of mortgage pool. B is correct. Seasonality es impathe level of prepayments—they are noticeably higher in the summertime. Increases in housing prices mspur increase in prepayments causerefinancing mortgages stemming from borrowers wanting to take out some of the increaseequity for personuse. The lower the age of the mortgage pool, the less likely the risk of prepayment. housing price这是什么机制？ 在中国也是房价上涨，导致提前还款增多么？
么意思啊？？不懂
