what maximum height ‘H’ may the box be pulled if it is to move with uniform velocity without overturning?

Question

A box is resting on a floor with coefficient of friction equal to 0.4. At what maximum height ‘H’ may the box be pulled if it is to move with uniform velocity without overturning?

         (a) H = 30 mm                (b) H = 60 mm            (c) H = 75 mm             (d) H = 150 mm