Answer:
Step-by-step explanation:
Heat the mixture to the boiling temperature of water until it evaporates completely is good for removing water from salt. So it should be the last step (4).
Centrifuge the mixture is good for removing fine suspended solids so it should be next to last step (3).
Screen the mixture through a fine mesh will remove coarse suspected solids so It should be the second step (2).
Remove the top layer will remove the oil so it should be the first step (1).