Final answer:
The British nicknamed patriot Francis Marion 'The Swamp Fox' due to his effective guerilla warfare tactics during the American Revolutionary War.
Step-by-step explanation:
The nickname given to patriot Francis Marion by the British was c) Fox. Marion was known for his elusive tactics in guerilla warfare during the American Revolutionary War, which frustrated British troops and earned him the nickname "The Swamp Fox." His actions were instrumental in the fight against Hessian soldiers, mercenary troops hired by Great Britain to put down the American rebellion.