Concept:Particles in a solid are tightly packed and can only vibrate about fixed positions.
Explanation:In a solid, the particles are close together because of strong intermolecular forces.
These forces prevent the particles from moving freely.
Instead, each particle vibrates around its fixed position.
This is why solids have a definite shape and volume.
Therefore, the correct choice is the option that says the particles are close together and vibrating.
Answer:B. close together and vibrating.