This question seems incomplete. I believe the answer choices are as followed:
Which postulate of the kinetic-molecular theory applies to the particles of a liquid?
O They do not move freely but vibrate in a stationary position.
O They can be compressed, which causes a large change in volume.
O They have so much kinetic energy that their intermolecular forces are negligible.
O They have enough kinetic energy to easily slide by each other.
The answer to this question is They have enough kinetic energy to easily slide by each other. (4th option).