If airplane A has 090 degrees set in the course selector, what will its VOR indications correspond to?

When an aircraft sets a course of 090 degrees in the VOR (VHF Omni-directional Range) navigation system, it indicates that the aircraft is oriented to fly directly east. VOR stations provide a means for pilots to determine their position and track a specific course based on their orientation to the station.

In this case, if airplane A has 090 degrees set in the course selector, the VOR indications will reflect the radial that corresponds to that course. When the course is set to 090 degrees, and the pilot is flying on that course, the VOR receiver will indicate that the airplane is on the 090-degree radial from the VOR station, which is directly east of the VOR.

Each instrument can represent different aspects of the VOR's functionality, but the indication for 090 degrees suggests that the pilot is flying directly east relative to the location of the VOR station. Therefore, the correct answer corresponds to the instrument that displays the proper visual representation for this settings, indicating that the aircraft is tracking exactly on that 090-degree course. This allows the pilot to maintain their intended flight path while navigating using the VOR system.