You have already run 4 miles. If you run at a speed of 8 miles per hour, how many total miles will you run in 2 more hours? Choose the correct equation and solution to this problem.
A.8x-4=y                      B.4+8x=y       C.4+8+x=y          D.8x-y=4        
   8(2)-4=y                    4+8(2)=y           4+8+(2)=y         8(2)-y=4
   16-4=y                       4+16=y             14=y                   16-y=4
    12=y                          20=y                                          y=12