# Which graph shows the relationship between the temperature and volume of a gas according to Charles's law?

$\text{Charles' Law}$ states that at constant pressure, $V \propto T$
So if $V \propto T$, then $V = k T$, where $k$ is some constant of proportionality, and $T$ is measured in $\text{degrees Kelvin}$.
And if $V = k T$, only the graph on the bottom right is an illustration of $\text{Charles' Law}$.