the answer is table d
the slope of the graph is 1/3 (rise 1, run 3) and the y intercept is at 0 so the equation of the line is y=1/3 x
if we plug in the x values to the equation, we will get the corresponding y values in the table:
y=1/3(12)=4
y=1/3(15)=5
y=1/3(18)=6
y=1/3(21)=7