Correct Answer: below freezing point

Solution : The correct option is below freezing point.

Supercooling refers to the state where a liquid is cooled below its freezing point, yet it maintains its liquid form. This can happen in extremely pure liquids or under certain conditions that prevent the formation of ice crystals. In this state, the liquid remains supercooled until it is disrupted or a nucleation site is introduced, prompting swift crystallization into a solid.