A man of mass 60 kg is pulling a mass M by an inextensible string passing over a frictionless (massless) pulley. The coefficient of friction between man and the ground is $\mu=\large\frac{1}{2}$. The maximum value of M that can be pulled by the man without slipping on ground is

Question

a) 51 kg

b) 26 kg

c) 46 kg

d) 32 kg