求助一题数学题~~~

小黄黄香蕉

If x and y are positive integers, which of the following CANNOT be the greatest common divisor of 35x and 20y?


       
A.  5

       
B.  5(x – y)

       
C.  20x

       
D.  20y

       
E.  35x

devilmars

C，35x/20x就已经不是integer了，20x不可能是35x的divisor