Microtubules are constituents of

Microtubules are polymers of the protein known as tubulin, which forms the cytoskeleton of the eukaryotic cell, thus providing shape and structure to it. Cilia, flagella, centrioles, basal bodies, spindle fibres, sensory hair etc. consist of microtubules. 

Nucleosome, peroxisomes and chromatin does not contain microtubules.

Hence, option C. i.e., Spindle fibres, centrioles and cilia, is the correct answer.