The only man who was not a member of the first triumvirate is Crassus. Hence, Option C is correct.
Who was Crassus?
The full name of Crassus is Marcus Licinius Crassus. He was a Roman general and statesman who played a key role in the transformation of the Roman Republic into the Roman Empire. He was also called "the richest man in Rome."
During the civil war, Crassus began his public career as a military commander under Lucius Cornelius Sulla. He also found his forces divided and the Parthian army massacring all of his forces.
An image is attached at the end for better understanding.
Thus, Option C is correct.
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