Final answer:
The design maneuvering speed is 1.3 times Vso, which is the speed at which an aircraft can safely execute its maximum maneuver loads without causing structural damage. Option (B) is correct.
Step-by-step explanation:
The design maneuvering speed is B. 1.3 times Vso. This is the speed at which an aircraft can safely execute its maximum maneuver loads, such as full deflection of the control surfaces, without causing structural damage. It is calculated as 1.3 times the stall speed in landing configuration (Vso).
The Manoeuvring Speed (VA) of an aircraft is an airspeed limitation determined by the aircraft designer. At speeds exceeding the maneuvering speed, full deflection of any flight control surface can result in damage to the aircraft structure.
Although maneuvering speed is one V speed not displayed on the airspeed indicator, it's one of the more important ones to know about, not just for the safety of your flight, but as a way to gain an understanding of how stall speed, load factor, and lift and weight interact in different phases of flight.