What color are taxiway markings on an airfield?

Answer: C — Yellow

Taxiway markings on an airfield are colored yellow. This color is standardized in aviation to provide clear visual cues for pilots and ground personnel. Yellow markings are specifically used to indicate taxiways, which are the paths that aircraft use to move to and from runways and other areas of the airfield. Using yellow helps ensure that these markings are easily distinguishable in various weather conditions and times of day, enhancing safety and operational efficiency. Each color in aviation serves a specific purpose, and following these standards is crucial for maintaining a safe airfield environment. The other colors mentioned in the choices have different meanings in aviation; for instance, red is often used for markings indicating hold short lines, while green may be used for boundaries or signage that directs ground traffic.