
Passage: On July 14, 2015, after difficult negotiations in the euro zone, the Greek debt crisis was temporarily quieted down. If the Greek debt crisis is not resolved, it will have a negative impact on the economy of the euro zone. But Greece can only return to the path of economic development through extensive reforms. Greece can either reduce welfare or achieve substantial economic growth, otherwise, the debt crisis will be difficult to solve.
Question: If the above statement is true, which of the following statements must be true?
A. A.If Greece reduces welfare or achieves substantial economic growth, it can solve the debt crisis
B. B.If the Greek debt crisis is properly resolved, it will not have a negative impact on the economy of the euro zone
C. C.If Greece is to solve its debt crisis, but cannot achieve substantial economic growth, it must reduce welfare
D. D.If Greece does not reduce welfare, or if it fails to achieve substantial economic development, it will have a negative impact on the economy of the euro zone
Answer: