Question

Which shows solutions to x + 2y = 8 if x and y must be whole numbers.
A.{(0, 8), (1, 5), (2, 4)}
B.{(8, 0), (6, 1), (4, 2)}
C.{(2, 4), (1, 6), (0, 8)}
D.{(0, 8), (1, 7), (2, 4)}

I know this question was asked before, but the answer wasint very clear to as of what to do here.

Anyways, all help is very appreciated. I always give a fan & a medal to anyone who explains and/or answers the question. Thanks! :)