Coefficient of permeability of soil A. does not depend upon temperature B. increases with the increase in temperature C. increases with the decrease in temperature D. none of the above

The correct answer is: A. does not depend upon temperature.

The coefficient of permeability is a measure of how easily a fluid can flow through a porous medium. It is a function of the pore size distribution, the tortuosity of the pores, and the viscosity of the fluid. The coefficient of permeability is not affected by temperature.

Option B is incorrect because the coefficient of permeability does not increase with the increase in temperature. Option C is incorrect because the coefficient of permeability does not increase with the decrease in temperature. Option D is incorrect because the coefficient of permeability does not depend upon temperature.