The correct answer is: B. White
According to the International Civil Aviation Organization (ICAO), all markings on the runways are white. This includes the centerline, edge lines, touchdown zone markings, and runway designation markings. The white color of these markings helps pilots to see them clearly, even in low-light conditions.
The centerline of the runway is a white line that runs down the middle of the runway. It helps pilots to keep their aircraft centered on the runway during takeoff and landing. The edge lines are white lines that run along the sides of the runway. They help pilots to stay within the boundaries of the runway. The touchdown zone markings are white bars that are located at the beginning of the runway. They help pilots to determine when they have reached the correct touchdown point for their aircraft. The runway designation markings are white letters or numbers that identify the runway. They are located at the beginning and end of the runway, as well as at intervals along the runway.
The white color of runway markings is important for safety reasons. It helps pilots to see the markings clearly, even in low-light conditions. This helps to prevent accidents and incidents.