Answer:
Microtubules.
Explanation:
The main cytoskeleton of the cell is micro tubules, micro filaments and intermediate filaments. This structure helps to provide the stability and maintains the cell shape.
Microtubules are made of the polymers of tubulin. The microtubules are hollow shape like protein that forms the main part of the cyoskeleton. The microtubules maintains the cell shape and allows the movement of the cellular organelles of the cell.
Thus, the correct answer is microtubules.
