A rectangular block measures $40cm\times 25cm\times 5cm$ and is made of a material of density $7800kg/m^3$. Calculate the pressure the block exerts on the floor when it stands on the smallest of its surfaces.

A. $3.12\times {10}^{3}N/m^2$
B. $3.00\times {10}^{3}N/m^2$
C. $1.95\times {10}^{4}N/m^2$
D. $3.12\times 104N/m^2$  

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Correct Answer: D