C is the correct answer.
The cytoskeleton is responsible for cell shape, motility, of the cell as a whole and motility of organelles within a cell. The cytoskeleton is extremely dynamic which is necessary for cells to be able to change shape , complete cell division, or migrate.
The cytoskeleton is the frame work of the cell. It is highly organized and also flexible. It does not seem the same as the human skeleton but some parts can act like our bones and other parts like our muscles.