It depends on which time period. But, probably A.
Feudalism was an agreement to exchange military service for d. land.
Many consider July 4, 1863 to be the turning point of the American Civil War. Two important, famous, well-documented battles resulted in Confederate defeats: the Battle of Gettysburg (Pennsylvania), July 1-3, and the Fall of Vicksburg (Mississippi), July 4. However, two other major, lesser-known events resulted in two additional Confederate defeats. Both losses, one in Tennessee and one in Arkansas, were influenced by the Vicksburg Campaign.
Ezra made it an offical part