The description of an aircraft with a stalling speed of 65 knots or less at maximum certified landing weight with full flaps, landing gear extended, and power off corresponds to which speed specification?

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Stall speed in the landing configuration is the speed at which the airplane will stall with full flaps and landing gear down, power off, at a given weight. The scenario describes that this stall occurs at 65 knots or less under maximum certified landing weight with full flaps and gear down, which is expressing the limit in numeric form. That direct numeric expression matches the described speed specification, making it the best choice. Other speeds refer to different concepts—Vfe is the maximum speed with flaps extended, Vmc is the minimum control speed with an engine inoperative, and while Vso is the stall speed in landing configuration, the question presents the threshold as a number rather than as the designation.