Question

what happens at a temperature of 0 kelvin?
all particles stop moving at 0 kelvin.
all particles form bonds with new particles at 0 kelvin.
all particles move at too fast of a rate to be sustainable at 0 kelvin.
scientists are unsure.

Explanation:

0 Kelvin (absolute zero) is the theoretical temperature where thermal motion (kinetic energy of particles) ceases. So particles stop moving. The other options are incorrect: bonding isn't forced, particles don't move fast, and scientists know the theory (even if it's unattainable in practice).

Answer:

A. All particles stop moving at 0 Kelvin.