The right answer is (B) contains mostly cellulose; forms the outer layer of animal cells.
The so-called pectocellulosic cell wall (consisting of pectin and cellulose) completely surrounds the cells and thereby plays the role of an internal medium of the plant or an inter-cellular medium. It is therefore involved in intercellular exchanges and communications (just like the cell membrane in animals, so A is false).
The cytoplasmic membrane or plasmalemma is located in contact with the cytoplasm, at the boundary between the inside and the outside of the cell.
