Correct option is (c) Czochralski method
To elaborate: Czochralski method is basically a method for the growth of a single crystal from a melt of the same composition. It is also widely used for the growth of the crystals of semiconducting materials, Si, Ge, GaAs, etc. It has also been used to produce laser generator materials such as Ca(NbO3)2 doped with neodymium.