MeSiCl3
Me2SiCl2
Me3SiCl
PhSiCl3
MeSiCl3, Me2SiCl2 and PhSiCl3 are monomers for a high molecular mass silicone polymer. However, Me3SiCl is not a monomer for a high molecular mass silicone polymer as it contains only one Cl atom and at best, it can form a dimer. Hence, the correct answer is option C.