The correct option is B Low-density polythene
Explanation: The shown structure has unconnected linear chains with some intermediate branches. This is a branched chain polymer. They are irregularly packed and have lower density and strength than linear polymers.
Low density polythene is an example of branched chain polymer.
Polyvinyl chloride and High-density polythene are linear polymers.
Bakelite is a cross linked polymer
Hence, option (a) is correct.