What controls the mode and range of TCAS displays within an EFIS?

The correct answer, which identifies the EFIS Control Panel, is appropriate because this component is specifically designed to manage the interfaces and displays of the Electronic Flight Instrument System (EFIS). The EFIS Control Panel allows pilots to adjust various settings, including those pertaining to Traffic Collision Avoidance System (TCAS) displays. Through this panel, pilots can select the desired range of the TCAS display, such as how far away traffic should be visible, and switch between different operational modes as needed.

The functionality of the EFIS Control Panel is crucial because it provides intuitive access to vital flight information and alerts, including traffic advisories, thereby enhancing situational awareness. This control mechanism is a fundamental part of the aircraft's avionics, allowing for safe management of operational parameters directly related to flight safety.

In contrast, while the Flight Management System plays a significant role in overall flight management, it does not directly control the TCAS display settings. The control yoke primarily helps in controlling the aircraft's flight path and does not interact with TCAS display configurations. The throttle quadrant deals with engine thrust and power management rather than navigation or traffic displays. Hence, the EFIS Control Panel stands out as the key interface for controlling TCAS display parameters.