The conclusion that can be drawn about Macon Bill of 1810 is that it helped American commerce, but harmed American foreign policy. Option A is correct.
In accordance with the Macon Bill, if either France or Britain agreed to observe the neutrality of the United States, the US would resume trading with that country and continue the embargo on the other. The French soon agreed to American demands.
The purpose of the Macon Bill of 1810 was to motivate Great Britain and France to stop seizing American vessels during the Napoleonic Wars.