The incomplete table below shows selected characteristics of gas laws.
[tex]\[
\begin{tabular}{|c|c|c|c|}
\hline
Name & Variables & Constants & Equation \\
\hline
Boyle's law & pressure, volume & temperature, moles of gas & $P_1 V_1 = P_2 V_2$ \\
\hline
Charles's law & volume, temperature & pressure, moles of gas & $\frac{V_1}{T_1} = \frac{V_2}{T_2}$ \\
\hline
Gay-Lussac's law & pressure, temperature & volume, moles of gas & $\frac{P_1}{T_1} = \frac{P_2}{T_2}$ \\
\hline
Combined gas law & pressure, volume, temperature & moles of gas & $\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}$ \\
\hline
\end{tabular}
\][/tex]
What are the variables in Gay-Lussac's law?
A. pressure and volume
B. pressure, temperature, and volume
C. pressure and temperature