What is the direction of electron flow in an electrical circuit?

The direction of electron flow in an electrical circuit is from areas of deficiency of electrons to areas of excess electrons, which is option B. This is based on the fundamental principle that electrons are negatively charged particles. In a circuit, high density or excess electrons create a negative charge, and regions where electrons are less dense result in a positive charge due to the absence of negative charges.

When a circuit is completed, electrons are attracted from the areas where they are less concentrated (deficiency) to areas where there are more electrons (excess), creating a flow of electric current. This flow is contrary to the conventional current flow, which is often described as moving from positive to negative, but understanding the actual motion of electrons as a flow from deficiency to excess is critical for comprehending how electrical systems function.

This insight establishes the accuracy of the chosen answer, highlighting the fundamental behavior of electrons in conductive materials within an electric circuit.