Why was lincoln disappointed with general george mcclellan?

C

Explanation:

He believed that McClellan was too cautious and not taking enough chances to win.

Lincoln was disappointed with General George McCellan because the general, although was able to establish an army in the early stages of the war, he was paranoid and was slow as the field commander and was able to aggressively engage with the Confederate Army of Virginia.

It's purpose was to purge France of enemies.