Which is suitable and best reason might which led to electricity reduction and the bulb reduced on their light

(A) Over loading of electric source
(B) Reduction of supply of electricity
(C) problems with the transformer
(D) poor connection of wires

All of the options mentioned could potentially lead to electricity reduction and a decrease in bulb light. However, the most suitable and best reason would depend on the specific circumstances and context.

(A) Overloading of the electric source: If the electric source is overloaded, it may not be able to supply enough electricity to power all the connected devices, leading to a reduction in the amount of electricity available for lighting bulbs.

(B) Reduction of supply of electricity: If the supply of electricity from the power grid or the electrical supplier is reduced, there will be less electricity available to power bulbs, resulting in a decrease in bulb light.

(C) Problems with the transformer: Transformers play a crucial role in transmitting and distributing electricity. If there are problems with the transformer, such as malfunctioning or damage, it may affect the supply of electricity to the bulbs and result in reduced light.

(D) Poor connection of wires: If the wiring system is not properly connected or if there are loose, damaged, or faulty wires, it can lead to electrical inefficiency and reduced bulb light.

Ultimately, the best reason would depend on the specific situation and the factors contributing to the electricity reduction and decreased bulb light. It is essential to assess the context and investigate the issue thoroughly to identify the most suitable reason.