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Since savings banks have to use short-term deposits to finance long-term fixed-rate mortgage loans, they sometimes lose money when there is a rise in short-term rates and, on the other hand, they are unable to raise the rates on their mortgages.

(A) when there is a rise in short-term rates and, on the other hand, they are unable to raise

(B) when short-term rates rise and they are unable to raise

(C) when a rise in short-term rates occurs and, correspondingly, there is no rise possible in

(D) with a rise in short-term rates, and they are unable to raise（B）

(E) with short-term rates on the rise and no rise possible in

如果把B 改成when short-term rates rise and （WHEN）they are unable to raise   这样才并列阿，从句的引导词能省略吗？ 省略了不就容易造成从句和“主句”并列的错觉吗？

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A有什么错？

rise可数的啊