BrainLab wrote:
The number of airplanes equipped with a new anticollision device has increased steadily during the past 2 years. during the same period, it has become increasingly common for key information about an airplane's altitude and speed to disappear suddenly from the air traffic controller's screen.The new anti collision device, which operates at the same frequency as air traffic radar, is therefore responsible for the sudden disappearance of key information.
Which one of the following if true most seriously weakens the argument?
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