When a point point having coordinate (x,y) is rotated about the origin in 90 degrees counter clockwise, the new coordinate becomes (-y,x).
In the graph given in (c),
C(-4,0) becomes C(0,-4).
A(-6,-2) becomes A(2,-6).
B(-3,-1) becomes B(1,-3)
Therefore, the figure given in option (b) is the correct figure.
