A man has a mass of 70 kg. What is the magnitude of the largest mass he can pull by a horizontal rope along a horizontal floor, if the coefficient of friction between the mass and the floor is 0.23, and that between his boot soles and the floor is 0.5?
A. 134.3 kg
B. 152.2 kg
C. 170 kg
D. 102.2 kg
E. 343.4 kg
Answer: B