Washington's assertion that "honesty is the best policy" in the context of foreign relations suggests that the United States should be straightforward and transparent about its intentions. Therefore, the most fitting response is:
There was no need to be coy about U.S. intentions to avoid permanent alliances in the future.
This reflects the idea that the U.S. should be clear in its stance against forming lasting alliances while honoring existing commitments, emphasizing transparency in its foreign policy.