An Architect Is Interested in Estimating the Rate of Energy

An architect is interested in estimating the rate of energy loss through heating,ΔQ/Δt,through a sheet of insulating material as a function of the thickness of the sheet.Assuming fixed temperatures on the two faces of the sheet and steady state thermal energy flow,which one of the graphs shown in the figure best represents the rate of thermal energy transfer as a function of the thickness of the insulating sheet?

A) A
B) B
C) C
D) D
E) E