Concept:Pressure is the force applied per unit area, and for a fixed weight, it increases as the contact area decreases.
Explanation:The pressure exerted is given by
P=AF, where
F is the man’s weight and
A is the contact area.
Since the man’s weight is constant, pressure is inversely proportional to area: smaller area gives greater pressure.
Lying flat on his back or belly spreads the weight over a very large area, so pressure is low.
Standing on both feet gives a moderate area.
Standing on the toes of one foot makes the contact area very small, so the pressure becomes greatest.
Answer:D. stands on the toes of one foot.