An electric power distribution system can be classified according to its feeder connection schemes or topologies as follows :

1. Radial distribution system

2. Parallel feeders distribution

3. Ring main distribution

4. Interconnected distribution

Ring main distribution system:- In this system each distribution transformer is fed with two feeders but in different paths. The feeders in this system form a loop which starts from the substation bus bars, runs through the load area feeding distribution transformers and returns to the sub station bus bars.

Advantage : There are fewer voltage fluctuations at consumer's terminal.

The system is very reliable as each distribution transformer is fed with two feeders that means, in the event of a fault in any sections of the feeder, the continuity of the supply is ensured from the alternative path.

Hence, the correct option is (B).