Martin mixed sulfur (a yellow solid) with iron filings (a black solid) in a ceramic dish called a crucible. then he separated them using a magnet. what kind of a change is this? change in state mixing and separation replacement synthesis

Separation of iron filings from its mixture with sulphur is an example of mixing and separation.

Explanation:

Detachment strategies abuse different physical and concoction properties of substances. At the point when a blend experiences partition it might bring about at least two blends or even unadulterated substances. Here partition of iron filings is accomplished by utilizing the attractive property of iron.  

Not many substances happen in unadulterated structure in nature. So as to get unadulterated substances, different partition methods must be utilized. Instances of partition methods are chromatographic detachment, centrifugation, electrophoresis, and so on.

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i'm assuming that the correct answer is indeed the first one/ "a"..