A student measures the rate of energy transfer by conduction through a uniform rod of fixed length L and cross-sectional area A. Plotting the measured rate ΔtQ on the vertical axis against the imposed temperature difference ΔT on the horizontal axis yields a straight line through the origin. Which of the following physical quantities is represented by the slope of this line?
a) L2kA
b) 2LkA
c) LkA
d) LπkA