Answer:
B.They have many start points as well as many end points.
Step-by-step explanation:
In a branched polymer side chains grow out of a main chain. The side chains are also made of same units as the main chain. These branches are a result of side reactions that occur during polymerisation.
The branches may serve as the starting or the end point of the chain. They may also be branched further. So the starting and the ending point of a branched polymer completely depends on the reference point. Branched polymers have reduced density because of lower packing efficiency.