Answer:
At the First Battle of Bull Run: C. Led many to believe falsely that the war would be short since the Union achieved a  quick decisive victory
Explanation:
After listening to Scottâs âAnaconda Planâ, many people believed that the war would end quickly as possible because they thought the capture of Confederate capital at Richmond was only one hundred miles south of Washington.
In âAnaconda Planâ, Scott had strategized to subdue the confederate states by first strangling them in the west, by capturing New Orleans, and then blocking the southern ports along with the Eastern and gulf coasts with the help of U.S. Navy. The press had ridiculed Scott when they dubbed his anaconda plan.