《最新GMAT数学机考模拟150题》陈向东__069 请指教谢谢

One number will be chosen randomly from each of the
sets above. If x represents the chosen member of Set X and y represents the
chosen member of Set Y, what is the probability that x/y will be an integer?

A.1/16     
B.3/8          C.1/2        D.3/4           E.15/16

正确答案是：B

"from each of the sets above"

不知道X和Y集合里都是些什么东西啊？这题手上没有这本书的话，好像无从下手。