How does reactive supply behave in relation to voltage under excessive loading?

Reactive supply is crucial in power systems as it supports voltage levels across the transmission network, especially during excessive loading conditions. Under these conditions, if the system experiences heavy loading, the voltage is likely to drop due to increased current demand. As the reactive power supply decreases, it is often observed to have an inverse relationship with the square of the voltage (V²). This means that when the voltage drops, the necessary reactive power to maintain stability decreases proportionally to the square of the voltage, indicating that insufficient reactive supply can further exacerbate voltage issues.

In summary, when the system is excessively loaded and voltage levels begin to lower, the reactive supply diminishes in a manner that relates to the square of the voltage, thereby reinforcing the idea that the correct answer reflects this relationship under excessive loading conditions. The other answers do not accurately represent the behavior of reactive supply in scenarios of significant system loading and voltage dropout.