Consider the following metallurgical processes`:`
`(I)` Heating impure metal with `CO` and distilling the resulting volatile carbonyl `(b.p. 43^(@)C)` and finally decomposition at `150^(@)-200^(@)C` to get the pure metal.
`(II)` Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide.
`(III)` Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and NaCl to obtain the metal.
The processes used for obtaining magnesium , nickel and copper are respectively.

Options

A. (I), (II), (III)
B. (II), (III), (I)
C. (I), (III), (II)
D. (II), (I), (III)

Answer

D