A student, by mistake, mixed sulphur pow...

A student, by mistake, mixed sulphur powder with iron filings. The following techniques were suggested to separate the sulphur from the mixture out of which he has to choose one :
A. dissolving in carbon disulphide filtration, evaporation
B. dissolving in water at room temperature and filtration
C. dissolving in hot waterm filtration and evaporation
D. dissolving in ice cold water and filtration
The correct technique is :

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