Final answer:
Under FAR 61.15, airmen must report motor vehicle actions within 30 days.
Step-by-step explanation:
Under FAR 61.15, which pertains to reporting motor vehicle actions for pilots in the United States, the correct timeframe for reporting such actions is (C) 30 days. According to the Federal Aviation Regulations (FAR), pilots are required to report any motor vehicle actions, such as convictions or license suspensions, to the FAA within 30 days.
This reporting ensures that the FAA has updated information about a pilot's legal and driving status, which is crucial for maintaining aviation safety standards. Pilots must adhere to this timeframe to comply with regulatory requirements and contribute to the overall safety of the aviation system.