Answer:
George McClellan, is the right answer.
Step-by-step explanation:
Abraham Lincoln served as the 16th U.S. President. He served in the period from 1861 until April 1865 (when he got assassinated). Whereas, George Brinton McClellan was a soldier, railroad executive, politician and civil engineer from America. It was his cautiousness caused a sense of strife with Abraham Lincoln, the then President of the United States.