The Ziegler-Natta catalyst is :
Ziegler-Natta catalyst (R3Al-TiCl4) is a mixture of titanium tetra chlore and alkyl derivative of aluminium.
It was first used by German scientist “Karl Ziegler” in 1950s for the polymerization of ethylene. Even now they are widely used for polymerization of olefins.
Hence opt. C is correct.