100
A mountain biker begins at the top of a mountain with an elevation of 8,453 feet. He rides 2,508 feet down the mountain before taking a break. He then rides another 584 feet up the mountain. At what elevation is he now?
A. 11,545 feet
B. 10,961 feet
C. 9,037 feet
D. 6,529 feet
D. 6,529 feet