Answer:
evaporation
Step-by-step explanation:
Evaporation is used in liquid and solid mixtures in which the liquid is evaporated. This method is effective when the liquid in the mixture easily evaporates, like water. Thus, we can conclude that evaporation would be the most efficient separation method for the student, shown in the question above, to use to separate the mixture of water and salt, because water would evaporate and salt would remain. This process is used in Brazilian salt flats to remove salt from seawater.