You can determine which is the correct graph by verifying the points on the graphs with the equation. Remember, the leftmost number in the parentheses is the "x-value" and the rightmost number is the "y-value".
Graph B has the points (0,2) and (2,6) on the line.
y = 2(0) + 2
y = 2
y = 2(2) + 2
y = 4 + 2
y = 6
As you can see, when the "x-values" are plugged into the equation, the value generated matches the "y-value" of the point. Not all the points on the other graphs are accurate according to the equation. You can prove this to yourself by following the same method as above.
