Answer
A
Work Step by Step
Carbohydrates offer structural support in the form of chitin and cellulose in plant cells, which provide flexibility and help hold up cell walls. They also assist in cell identity, as oligosaccharides on red blood cells help identify blood type. Carbohydrates also store energy in the form of starch and glycogen. They are also present in complex molecules, acting as the base sugar in DNA and RNA.
