Final answer:
The acceptable range of variation for the altitude readout compared to the pilot-reported altitude is 100 feet.
Step-by-step explanation:
The question is asking about the acceptable range of variation for the altitude readout compared to the pilot-reported altitude. The correct answer is B) 100 feet. Altitude refers to the height of an object above a fixed reference point, such as sea level. In aviation, accurate altitude readings are crucial for safe navigation. The question is specifically asking for the maximum allowable difference between the altitude readout and the pilot-reported altitude, and the correct answer is 100 feet.