Which of the following is an example of good preflight planning?

Good preflight planning involves a thorough assessment of various factors to ensure safety and efficiency during the flight. Assessing fuel needs and runway requirements is essential because it directly impacts the aircraft's performance and the flight's overall safety. This involves calculating how much fuel is necessary for the journey while considering factors such as distance, altitude, weight, and the specific aircraft's fuel consumption rates. Additionally, understanding runway requirements includes evaluating runway lengths, widths, and surface conditions, which helps determine if the aircraft can safely take off and land at the chosen airport.

In contrast, choosing the most scenic route, planning for only clear weather, and ignoring personal health before the flight do not encompass the critical safety and operational aspects of preflight planning. Scenic routes may prioritize aesthetics over the necessary logistics and hazards of flying, while only planning for clear weather ignores the unpredictability of weather conditions that could arise. Ignoring personal health is equally critical as it pertains to the pilot's ability to operate the aircraft safely. Therefore, option B stands out for its comprehensive approach to ensuring a safe flying experience.