What is the function of the distribution box in domestic electrical circuits?
${\text{A}}{\text{.}}$ It distributes voltage across appliances as per need.
${\text{B}}{\text{.}}$ It provides isolation between sets of appliances and improves reliability.
${\text{C}}{\text{.}}$ It distributes losses among all parts of the circuit equally.
${\text{D}}{\text{.}}$ It allows the user to manually distribute power as per his need.

Hint: Here, we will proceed by defining the term distribution box. Then, we will mention the necessary major properties (or traits) that these distribution boxes should possess.

Complete Step-by-Step solution:
A distribution board is the main electrical supply system for any commercial or residential entity. The main cable comes into the distribution board and then via breakers get distributed in the secondary circuits such as lights and plugs. For optimal performance of every device, it is necessary to maintain a proper power distribution and is crucial for home and appliance safety.
Distribution boards are not just a mere enclosure but an overall system in itself having neutral links, earth leakage units and interconnecting wires for the sole purpose of proper electrical distribution in your house.
Distribution boards that are available these days must acquire these three major traits:
Safety- One crucial part of every distribution board is the fuse. Fuse is an important component of a distribution board as it doesn’t allow overcurrent to pass through your circuitry. In the case of overcurrent, the fuse automatically shuts down the major supply preventing your appliances and any sort of electrical danger at your home or at your office.
 Aesthetics- Apart from safety, these days high attention is being paid towards the design and style of distribution boards. Gone are the days when distribution boards ruined the overall décor and aesthetics either at home or at office.
User-Friendly- It should possess sufficient space for wires with the easy installation procedure. The frame should dismiss any possibility of error during installation. A well-installed and user-friendly distribution boards ensure the long life of your electrical distribution system and safety. Also, there will be a bonus if the distribution box being used is easy in terms of maintenance.
Distribution box in a domestic electrical circuit provides isolation between appliances and allows them to work parallel. If failure occurs in one part, then it doesn’t affect the functioning of the other which leads to the improvement of the reliability of the distribution box.

Therefore, option B is correct.

Note- Majorly, a distribution board comes in two categories which are single door distribution board and double door distribution box. A single door distribution board is used which is available in 4-way, 8-way, 16-way configurations. For more heavy-duty operations and increased number of applications and connections, a double door distribution board is used.