Based on the information provided, Congress might have been divided about declaring war on Britain for a few reasons. However, the most direct answer from the options given is:
A. members of Congress did not believe the American military could compete with the British military.
This option reflects the disparities in military preparedness and strength between the United States and Britain, which could have caused hesitation among Congress members regarding the declaration of war. The overwhelming advantage in troops, ships, and overall military resources that Britain possessed likely contributed to doubts about the viability of engaging in a war at that time.
Option B might also have influenced opinions, but it doesn’t speak as strongly to the military comparison. Option C is more specific and doesn't necessarily address the overall debate about war, while option D pertains to internal party dynamics rather than the general concerns over military capability or legitimacy of the war.