It could be implied that the rising of the interest rate ( ).

参考解析：

细节题。A项对应原文：South-East Asia Analysts says that, as longs as the rate of interest stays above the rate of growth in national income, then the ratio of debt to income will get worse. Falling interest rates help towards overcoming this problem由此可知错误；C项对应的是：The lowering of German interest rates may bring some relief to other members of the European Exchange Rate Mechanism CERM,由此可知错误；B项对应的是：However, Germany's importance as Europe's largest export market may decline，由此可知错误。所以正确答案选D。