请教一道语法题

4.     Developing nations in various parts of the world have amassed $700 billion in debts; at stake, should a significant number of these debts be repudiated, is the solvency of some of the world’s largest multinational banks.

(A) should a significant number of these debts be repudiated, is

(B) should a significant number of these debts be repudiated, are

(C) should they repudiate a significant number of these debts, are

(D) if there is a repudiation of a significant number of these debts, would be（A）

(E) if a significant number of these debts will be repudiated, is

哭了,语法好差啊.这题怎么回事啊,看不懂啊

这是一个倒装句:

in normal grammar logic, it should be:

Should a significant number of these debts be repudiated, the solvency of some of the world's largest multinational banks is at stake

(一旦这些债物被拒付,一些世界上最大的银行的偿还能力就很危险)