At a game booth, a student gets a box of candy as the prize for winning a game. The boxes come in four colors; white, red, green, and blue. There are 8 boxes of each color. All of the boxes are equally likely to be given away as prizes. Which expression shows the probability of the first winner receiving a white box and the second winner also receiving a box of the same color?

A: (8/32)•(8/31)
B: (8/32)+(8/31)
C: (8/32)+(7/31)
D: (8/32)+(7/31)