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1.                            
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

WHAT's wrong with D? thanks