In the cytoskeleton these are the thickest of the three components, typically in cell maintenance of cell shape, chromosome movement and organelle movements.

The correct answer is - Microtubules

Explanation:

The cytoskeleton is a complex web of fibers present and find throughout the cytoplasm

It helps in organizing the shape size, structures and activities of the cell, anchoring many organelles . It is made up of of 3 types of molecular components:  Microtubules , Microfilaments , and Intermediate filaments.

Microtubules : it is the thickest of of all the 3 components of the cytoskeleton as it is made up of tubulin.  Maintenance of cell shape, organelle movements, chromosome movements in cell division, cell motility are major role of microtubules.

Thus, the correct answer is - Microtubules