The correct options are
A blood
C ink
D milk
Filtration process is used to separate insoluble solids from liquids. The insoluble solids have particle size bigger than the size of pores present in the filter medium.
Brewing coffee involves passing hot water through the ground coffee and a filter. The liquid coffee is the filtrate. Due to the difference in particle size of coffee and water, filtration is used.
Ink, blood, and milk cannot be separated by filtration because the solute particles are very small in size and light in weight.