Final answer:
The full-scale deflection on a VOR is 10 degrees, indicating how far an aircraft is from its intended course. A centered CDI needle on the VOR indicates the correct path, while a deflection shows the degree of deviation. Therefore, the correct option is B.
Step-by-step explanation:
The full-scale deflection on a VOR (VHF Omnidirectional Range) indicator is 10 degrees on either side of the centered needle position. When the aircraft is on the correct path, the course deviation indicator (CDI) needle is centered. If the aircraft drifts off course, the CDI needle moves away from the center; a full-scale deflection indicates that the aircraft is approximately 10 degrees off the intended course. VOR systems provide pilots with navigational information by transmitting a VHF radio composite signal including the station's Morse code identifier (or voice identifier) and navigation signal which allows the pilot to find the radial they are crossing and whether they are flying toward or away from the station.