so the question says that x is a multiple of y that means that y times something=x or
yz=x
A. says y is a factor of x
this is true because y times z=x so y is a factor of x
I can't read B and D
C. so it says x if a factor of 2y this might be true or false because if y is 2 and x=20 then 2y=4 and 20 is not a factor of 4
if we have y=2 x=4 then 2y=4 and 4 is a factor of 4