Given below are the steps involved in the process of zone refining for removing impurities which are more soluble in the melt than solid state of the metal.

A. Impurities get concentrated at one end.

B. As the heater moves forward, the pure metal crystallises out of the melt left behind and the impurities pass to the next zone.

C. A mobile heater surrounding the rod of impure metal is fixed at its one end.

D. The end is cut off.

E. The molten zone moves along with the heater which is moved forward.

Choose the correct answer from the options given below: