Which answer choice correctly states and describes the relationship between volume and particle motion within the states of matter?
a: they have a direct relationship, so when the volume for a state of matter increases, its particle motion increases.
b: they have an indirect relationship, so when the volume for a state of matter increases, its particle motion decreases.
c: they have a stable relationship, so the volume and particle motion for a state of matter are equal to each other at all times.
d: they do not have any relationship, so they do not affect each other.