Look at the apparatus setup. It cannot be used to separate which of the following mixtures?
The above setup is of filtration. There are some mixtures which contain insoluble solid particles suspended in a liquid. These suspended solid particles which are insoluble in a liquid can be obtained by passing the mixture through a filter paper. The filter paper has minute pores that trap the solid particles. Out of all the given options, the mixture of alcohol and water is a mixture of miscible liquids. It doesn't contain any insoluble suspended solid particles. Hence, the components cannot be separated by filtration.