Which is the graph of a logarithmic function? a b c or d

Answer-

The D plot represents the logarithmic function.

Solution-

1st plot represents the rectangular hyperbola (with vertical asymptote at x=3 and horizontal asymptotes at y=0),

2nd plot represents the straight line (passing through origin and slope 1/5),

3rd plot represents the parabola (vertex at 3, 0),

 (where c is a constant)

4th plot represents the logarithmic curve,

             (where c is a constant)

∴ The 4th graph is a graph of a logarithmic function.