Final answer:
Manufacturers and wealthy citizens with commercial interests were the main supporters of the Federalist Party, especially in the northern states and certain southern regions.
Step-by-step explanation:
The group that mostly supported the Federalist Party was c) Manufacturers. The Federalist Party attracted wealthy citizens with commercial and manufacturing interests. Significant support also came from people engaged in work at the Atlantic seaports, due to their dependency on foreign trade, and from those who were in favor of the government pursuing economic development.
In terms of geographical strength, Federalists were predominantly strong in the North but had a notable presence in certain Southern states including Virginia, North Carolina, and South Carolina. Differing from the Federalists, the Republican Party found support mainly among wealthy landowners tied to plantation-based slavery, ordinary farmers, and less prosperous merchants.