A) Increase kinetic energy
In a molecule, the kinetic energy existing it is "directly proportional" to temperature of molecule. If one of the values increases, then the other value also increases and vice-versa.
This is best explained by the Amonton's law where the last postulates states that the "average kinetic energy" depends on the gaseous temperature.
Consequently, the normal dynamic vitality of the gas particles increments as the gas winds up hotter. Since, the mass of these particles is steady, their motor vitality can possibly increment if the normal speed of the particles increments.
