The price, s, of a mountain bike at Speed Cycling is $210 less than twice the price, d, of the same bike at Downhill Racing. The difference in price between the bike at Speed Cycling and Downhill Racing is $320. Which system of equations can be used to determine the price of the bike at each store? A.
2s - d = 210
s - d = -320

B.
s - 2d = -210
s - d = -320

C.
2s - 2d = 210
s + d = 320

D.
s - 2d = -210
s - d = 320