Which method of refueling allows the wing tanks to be filled simultaneously?

Single point pressure refueling is the correct method that allows the wing tanks to be filled simultaneously. This refueling method utilizes a single point on the aircraft, generally located on the fuselage, where fuel can be pumped into the aircraft's tanks under pressure. This system is efficient and reduces the amount of time required for refueling because it allows for the simultaneous filling of all tanks, including both wing tanks and fuselage tanks, through a single connection.

In contrast, over the wing gravity refueling involves filling the tanks through openings located on the top of the wings, where gravity pulls the fuel down into the tanks. This method is slower and typically requires each tank to be filled one at a time. Combat refueling refers to the process of refueling an aircraft in-flight, which is a different procedure altogether and does not apply to ground refueling tanks. Tanker refueling is also focused on refueling in-flight and lacks the capability of ground simultaneous filling. Thus, the advantages of single point pressure refueling in terms of efficiency and speed make it the preferred method for filling wing tanks at the same time.