`MeSiCl` is used during polymerisation of organo silicones because
A. the chain length of organosilicone polymers can be controlled by adding `Me_(3)SiCl`
B. `Me_(3)SiCl` blocks the end terminal of silicone polymer
C. `Me_(3)SiCl` improves the quality and yield of the polymer
D. `Me_(3)SiCl` acts as a catalyst during polymerisation.
