Step 1: Relationship between pressure and temperature.
For an ideal gas, the pressure is directly proportional to the temperature. The average force on the walls of the container is related to the pressure of the gas, which depends on the temperature as \( P \propto T \). The force is proportional to the pressure, so the force depends on \( T^1 \).
Step 2: Conclusion.
Thus, the value of \( x \) is 1, corresponding to option (A).