How do you read a sensor value from a sensor named 'sonar'?

• A. ReadSensor(sonar)
• B. sensor[sonar]
• C. SensorValue[sonar]
• D. getSensor(sonar)

Answer: (C)

The important idea is that sensor readings are stored in a built-in array called SensorValue, with each sensor identified by its name. To get the sonar’s current measurement, you pull the latest entry from that array using the sensor’s name: SensorValue[sonar]. This returns the numeric value you can use directly in comparisons or calculations. Other options wouldn’t yield the actual reading: a function-style call would require a defined function, sensor[sonar] would refer to the sensor object rather than its current value, and getSensor isn’t a standard accessor in this context.