How many fuel sample ports are located on the aircraft?

The correct response accurately reflects the typical design of many military aircraft, which usually feature a fuel sample port on each wing and an additional port located in the belly of the aircraft. This configuration allows for efficient and effective sampling of fuel from different sections of the fuel system, ensuring that any contaminants or discrepancies can be detected before flight operations.

Having one port per wing provides the ability to monitor fuel quality at the outer sections where most operational fuel is stored, while the belly port often serves as a central point for larger fuel tanks or systems. This method of sampling is essential for maintaining the integrity and safety of the aircraft's fuel, particularly in military operations where conditions can vary significantly.

The other options might suggest configurations that do not match standard military aircraft designs or complicate the fuel sampling process, potentially leading to inefficiencies or inaccuracies in fuel quality assessments.