What is the minimum rest period required before starting a series of early morning duties for a crew member?

The correct answer, which indicates a minimum rest period of 24 hours before beginning a series of early morning duties for a crew member, is based on safety regulations pertaining to aviation and the need for crew members to be adequately rested before performing their responsibilities. This rest requirement is designed to mitigate the effects of fatigue, which can significantly impair a crew member's performance.

In aviation, regulations established by authorities such as the Federal Aviation Administration (FAA) or other relevant bodies typically mandate this rest period to ensure that pilots and crew are well-rested and capable of maintaining the highest safety standards. Ensuring a full 24-hour rest before undertaking duties allows for sufficient recovery time from previous shifts and helps to maintain alertness during early morning schedules, which are often associated with challenges such as circadian rhythm disruptions.

The other options do not meet the minimum regulatory standards for rest periods, making them insufficient for ensuring the safety and performance of aviation crew members. Therefore, the establishment of 24 hours as the minimum rest period aligns with best practices in aviation safety management.