Prokaryotes consist of bacteria and the archaea. They contain plasma membrane, cytoplasm, DNA, ribosomes and lack unit membrane bound cell organelles.
Diffusion refers to the net movement of anything from a region of higher concentration to a region of lower concentration.
Because of its small size, prokaryotes depends on diffusion to obtain some materials and to get rid of wastes.
So, the correct answer is diffusion.
Other options:-
ribosomes- incorrect ( ribosomes are sites of protein synthesis )
flagella- incorrect ( flagella are used for cell movement )
Cell division - incorrect ( cell division is the process by which the cell multiplies )
Learn more about prokaryotes:-
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