What information is primarily displayed on a Primary Flight Display (PFD)?

The Primary Flight Display (PFD) is a crucial component in an aircraft's avionics suite, primarily designed to present essential flight data to the pilot. This display typically includes critical information such as the aircraft's attitude, altitude, airspeed, and heading. By centralizing this vital information, the PFD enhances situational awareness and helps pilots make informed decisions during flight operations.

In contrast, while the other options may describe various functionalities found in different displays or systems on an aircraft, they do not capture the primary purpose of the PFD. For instance, moving maps and weather information are generally shown on a Multi-Function Display (MFD), which is separate from the PFD. Similarly, aircraft system status and traffic might be presented on other display screens dedicated to those tasks. Backup data for navigation usually refers to secondary systems that support navigation but are not the main focus of the PFD. Thus, B accurately reflects what a PFD is designed to showcase: the immediate and essential flight data necessary for piloting the aircraft safely.