Which Laboratory Observation Would Most Support the Kinetic Theory's Assumption

Multiple Choice

Which laboratory observation would most support the kinetic theory's assumption that molecules in a gas are widely separated?

A) A gas exerts the same pressure on each part of a container's wall.
B) A gas is highly compressible.
C) A gas with a lower formula mass diffuses more rapidly than one with a higher formula mass.
D) A gas expands when the pressure on it is released.