According to Boyle's Law, the Pressure of a Gas Increases

According to Boyle's Law, the pressure of a gas increases as the volume decreases because

A) the gas particles get bigger.
B) the kinetic energy of the gas particles increases.
C) the temperature of the gas increases.
D) the gas particles strike the walls of the container with more force.
E) the gas particles strike the walls of the container more often.