The international policy response was successful in mitigating upward pressure and interbank rate volatility on the U.S. dollar. During the financial crisis, there was a severe shortage of U.S. dollars among banks outside the United States. This shortage was due to a variety of factors, including an increased appetite for foreign currency assets, a U.S. dollar funding gap, and the reversal of carry trades. The international policy response was designed to address this shortage and stabilize the financial markets. One of the key successes of this response was its ability to mitigate upward pressure and interbank rate volatility on the U.S. dollar. By doing so, it helped to stabilize the value of the U.S. dollar and reduce the risk of further financial instability.

Choice A is incorrect. The international policy response was not aimed at increasing the appetite for foreign currency assets. Instead, it was designed to address the shortage of U.S. dollars among banks outside the United States during the financial crisis.

Choice B is incorrect. The international policy response did not lead to a U.S. dollar funding gap; rather, it was a measure taken to alleviate such a gap that had arisen due to the financial crisis.

Choice C is incorrect. While carry trades may have been affected by various factors during the financial crisis, there's no evidence that suggests that they were directly influenced by this particular international policy response.