The correct answer is option B, that is, cellulose forms the cell walls of all the plant cells.
Explanation:
Cellulose is an essential structural constituent of the primary cell wall of all the green plants. It is the most abundant organic polymer found on the planet. A structural layer enveloping some kinds of cells, that is, just external to the cell membrane is known as a cell wall. The composition of the cell wall differs among the species and may rely upon the type of cell and the stage of development. The primary cell wall of land plants comprises the polysaccharides, that is, hemicellulose, cellulose, and pectin.
A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction.