The correct answer is B.
This is because for two lines to have no solutions they must have the same slope and different y intercepts. In this case we can distribute the -3 in the B equation and see this is precisely what we get.
y = -3(x + 6)
y = -3x - 18
Since the slopes are now the same in both equations (-3) and the intercepts are different (6 and - 18), we know they are parallel and have no solution.