Some of the tensions that resulted in South Carolina’s rejection of federal authority during president Jackson’s administration include the readiness of President Jackson to use federal force in order to preserve the Union. Jackson also differed with his vice president Calhoun over the nullification issue which led Calhoun to resign
Soldiers also made dugouts and funk holes in the side of the trenches to give them some protection from the weather and enemy fire. The front-line trenches were also protected by barbed-wire entanglements and machine-gun posts. Short trenches called saps were dug from the front-trench into No-Man's Land.
I think A. would be the best answer
