A car tyre is inflated with air. as the car drives, the temperature of the tyre increases, which also causes the temperature of the air inside the tyre to increase. this increases the pressure of the air inside the tyre. which of the following is a correct explanation as to why?

a. the mass of air inside the tyre has increased.
b. the area of the tyre has decreased, thus increasing the pressure.
c. the air molecules collide with each other less frequently.
d. the average kinetic energy of the air molecules has increased.