An increase in temperature causes an increase in gas pressure because the average force of molecules colliding with the walls of the container increases.

An increase in temperature causes an increase in gas pressure because the frequency of molecules colliding with the walls of the container increases.

Real gases deviate from ideal gases because of the finite size of the molecules and the attractive and repulsive interactions between molecules.

All gases behave like ideal gases at sufficiently low pressures and high temperatures.

The PV/nRT ratio for real gases can be greater than 1 because of the attractive forces between molecules.