Answer:
A. Brownout
Step-by-step explanation:
From the description, it seems that the term that would best describe this would be a Brownout. This is because a brownout occurs when there is very low system voltage passing through the electrical system in comparison to the normal everyday voltage. This would cause lights to become dimmer because they are not getting the necessary voltage, while electrical devices would still function because they are still receiving the minimum voltage required. The sudden flicker may be due to certain devices shutting down in the company and therefore allowing a sudden surge of voltage to be used in the system.