Based on the question and the possible responses, the most logical answer to why Congress might have been divided about declaring war on Britain is:
Southern representatives were less concerned about British interference in American shipping.
This response suggests a regional divide in priorities and concerns, which could lead to differing opinions on the issue of declaring war. The other options focus on military capabilities or skepticism about specific events, but the regional perspective of Southern representatives being less concerned aligns well with historical sentiments that influenced Congress's decision-making.