Which of the following set of variables gives a straight line with a negative slope when plotted? (p = vapour pressure and T = temperature in Kelvin)

y-axis - p                    x-axis - T 

y-axis - ${\log }_{10}\mathrm{p}$             x-axis T

y-axis - ${\log }_{10}\mathrm{p}$                 x-axis - $\frac{1}{\mathrm{T}}$

y-axis - ${\log }_{10}\mathrm{p}$             x-axis - ${\log }_{10}\frac{1}{\mathrm{T}}$