Question

living organisms break down polysaccharides into
simple sugars.
complex monomers.
complex carbohydrates.
simple polymers.

Explanation:

Polysaccharides are complex carbohydrates made of many simple sugar (monosaccharide) units. Through processes like digestion, living organisms break down these large polysaccharide molecules. The goal is to obtain the smaller, more usable units. Simple sugars (monosaccharides) are the basic building blocks of carbohydrates. Complex monomers is an incorrect term as monomers of carbohydrates are simple. Complex carbohydrates are what polysaccharides themselves are. Simple polymers is also wrong as polysaccharides are polymers and breaking them down would not result in polymers.

Answer:

simple sugars.