Answer is A .
How?
See the horizontal line parallel to x-axis.Now with the help of graph,I can write some points on that horizontal line which are:(0,3),(2,3),(-2,3),etc.Just analyze these points.In these points you can see that y-coordinate is constant and is equal to 3.So the equation of this horizontal line is:
y=3 which is analogous to y<=3(Why not y>=3 because the line limits the value to 3 )
The slanted line can be represented by y>2x-1
Also see this image to know why this slanted line bounds the region y>2x-1