living organisms break down polysaccharides into\nsimple sugars.\ncomplex monomers.\ncomplex…

Brief Explanations:

Polysaccharides are complex carbohydrates made of many sugar - units. Living organisms break them down into their building - blocks which are simple sugars (monosaccharides). Complex monomers is incorrect as monomers are simple units. Complex carbohydrates are what polysaccharides are, not what they break down into. Simple polymers are not the products of polysaccharide breakdown.

Answer:

simple sugars.