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