Question

cellulose is found throughout the cell walls of plant cells. cellulose makes cell walls rigid, which indicates that cellulose is a
carbohydrate.
lipid.
nucleic acid.
protein.

Explanation:

Cellulose is a polysaccharide, which is a type of carbohydrate. It provides structural support to plant - cell walls. Lipids are mainly for energy storage and membrane - formation, nucleic acids carry genetic information, and proteins have various functions like catalysis and structure but cellulose is not a protein.

Answer:

A. carbohydrate