The question requires us to choose the best option to describe what happens when the temperature of a gas increases.
When the temperature of a gas increases, the gas gains kinetic energy and starts moving faster (the speed of movement increases). As a consequence, the particles of gas will collide more often, both among themselves and with the sides of the container. The collisions with the walls of the container contribute to increase the pressure of the gas.
Therefore, considering the information above, the best option to answer this question is the second one, "The number of collisions of gas particles increases."