The correct option is C Gas vacuoles
Inclusion bodies store the reserve material in prokaryotic cells. These are non-membrane bound structures and lie freely in the cytoplasm. The various inclusion bodies include phosphate
granules, cyanophycean granules, glycogen granules and gas vacuoles.
In blue green algae, purple and green photosynthetic bacteria, gas vacuoles help in providing buoyancy.
Contractile vacuoles help in excretion and osmoregulation. These are usually found in eukaryotic cells such as Amoeba.
Microtubules are components of cytoskeleton; their function is to provide cell shape.
Centrioles form the basal body of cilia and flagella that facilitate locomotion. In animal cells, centrioles also form spindle apparatus during cell division.