What is the state of the particles in a solid according to kinetic theory?

The correct choice highlights that in a solid, particles vibrate next to each other rather than moving freely. According to kinetic theory, solids have a definite shape and volume because the particles are closely packed together in a fixed arrangement. Although these particles have kinetic energy, they do not have enough energy to overcome the attractive forces holding them together, which is why they can only vibrate in place rather than move freely or flow past each other. This vibrational motion allows for some energy transfer, but the integrity and structure of the solid remain intact, which differentiates it from liquids and gases where particles exhibit more freedom of movement.