Acharacteristic of matter that’s not associated with a change in its chemical composition is known as a/an property.

Physical property

Explanation:

Physical characteristic of matter is not associated with the changes in its chemical composition.Some of these properties are color and density that can be observed without altering the physical state of the matter.Other physical properties such as freezing and melting are observed when a change in physical state of matter. When there is not change in the identities of substances contained in the matter then that's a physical change property.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.