The correct option is C Cell wall
The cells of some protists, fungi, algae, and plants have a protective semi-transparent covering outside the cell called as the cell wall. It is significantly thick, strong and rigid. Animal cells have a cell membrane instead of a cell wall, making tissue flaccid. This means that it is soft, pliable and not as heavy as plant tissue. This is part of what enables animals to move. Whereas plants have no skeleton or exoskeleton and are held up by their tissue. The plant tissue is made up of cells with rigid cell walls. Thus, the correct answer is option C.