Which of the following would provide the best evidence of compliance with an airline’s standard of having aircraft refueled and cleaned within a specified time of arrival at an airport?

Which of the following would provide the best evidence of compliance with an airline’s standard of having aircraft refueled and cleaned within a specified time of arrival at an airport?
A . Vendor fuel invoices that have been reconciled to inventory records.
B . Time cards completed by aircraft cleaning and fueling crews.
C . Observation of selected aircraft while they are being refueled and cleaned.
D . Comparison of the standard hourly labor costs for cleaning and fueling personnel with actual labor charges.

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Answer: C