how were general William t. sherman's tactics different from others used during the civil war?

A. it was the first time guerilla warfare (small, hit-and-run tactics) was used in an American war.
B. he used new methods with early airplane technology.
C. he used scorched earth or total war tactics, burning farms and crop fields to devastate the south's resource
D. he attacked from the ocean, starting at the savannah port and marching north to atlanta

C. he used scorched earth or total war tactics, burning farms and crop fields to devastate the south's resources.