A flashing red light from the control tower while taxiing indicates what action should be taken?

A flashing red light from the control tower while taxiing signifies that an aircraft must clear the runway or taxiway immediately. This light indicates an urgent situation where the controller is signaling the need for immediate action to prevent potential hazards, such as an approaching aircraft or vehicle that may impact safety.

This signal is critical for the safety of all operations at the airport, as it helps prevent incidents between aircraft and ensures that any necessary precautions are taken without delay. Understanding this signal and its implications is essential for pilots, as it directly relates to maintaining safety during ground operations. The other options do not convey the urgency or immediate action required in response to a flashing red light.