Freezing involves the conversion of :
liquid to a solid-state.
Explanation for correct answer:
c. liquid to a solid-state - Freezing is the process through which material transitions solid-state from a liquid to a solid-state.
Explanation for incorrect answers:
a. solid to a liquid state - Melting is the transformation of a solid into a liquid.
b. liquid to a gaseous state - Evaporation happens when particles in a liquid move straight into the gas state at temperatures lower than the liquid's boiling point.
d. Solid to a gaseous state - Sublimation is the process by which a solid transition straight to a gaseous state without going through a liquid state.
Hence, option c) is the correct answer.