a. y = 1/2x +2b. y = 1/2xc. y = 2xd. y = 2x + 2

Given data:
The given graph.
The graph passes through the origin it means the value of the constant is zero, so the equation is either y=1/2 x or y=2x.
From the graph x=2 then y=1 so t satisfy y=1/2 x.
Thus, option b) is correct.