The correct answer is the following.
Although there are no options attached we can say the following.
Some Northerners felt like they needed General George McClellan to take command because they considered McClellan as an experienced man that had the support of his men.
However, in the end, General McClellan proved to be an incapable leader for the North for the following two reasons. McClellan was overly cautious as battles neared and he always believed he was outnumbered. These aspects infuriated President Abraham Lincoln and the US President decided to remove him.
General George McClellan could not decisively defeat the Confederate Army led by General Robert E.Lee during the famous Battle of Antietam, Maryland.