#### Answer

The correct answer is:
(c) temperature only

#### Work Step by Step

We can write an expression for the average kinetic energy:
$\overline{KE} = \frac{3}{2}~\frac{PV}{N}$
$\overline{KE} = \frac{3}{2}~kT$
The average kinetic energy can not be found from pressure only, or from number of molecules only. However, since the value of $k$ is a constant, the average kinetic energy can be found from temperature only.
The correct answer is:
(c) temperature only