Which macromolecule is a primary component of cell walls, and which argument provides evidence for how the structure of this molecule relates to its purpose within the cell wall? A Lipids are the primary component, and they repel and prevent excess uptake of water because they form carbon chains.

B Lipids are the primary component, and they protect the cell and help maintain its shape because they form carbon rings.

C Carbohydrates are the primary component, and they repel and prevent excess uptake of water because they form carbon chains.

D Carbohydrates are the primary component, and they protect the cell and help maintain its shape because they form carbon rings.