Rapid quenching of a steel from the austenitic range results in a hard, brittle structure as, what?
A) The carbon atoms are trapped in the crystal lattice, causing the steel to become brittle.
B) The rapid cooling prevents the formation of pearlite, resulting in a hard structure.
C) The steel undergoes phase transformation, forming martensite which is hard and brittle.
D) The quenching process introduces impurities into the steel, making it brittle.