What additional fuel requirement must be met for a day cross-country flight under VFR conditions?

For VFR day cross-country flights, the regulation stipulates that pilots must ensure they have enough fuel to reach their destination and reserve fuel to fly for an additional 30 minutes. This requirement is in place to account for potential unexpected delays, such as air traffic delays or changes in flight conditions that could necessitate additional flying time after reaching the intended destination. This safety margin helps ensure that pilots maintain operational flexibility and reserve fuel for unforeseen circumstances, increasing the safety of the flight.

In contrast, other options detail scenarios that are either not required for VFR day flights or pertain to different regulations. For instance, returning to the original departure point, having a one-hour reserve, or planning for an alternate destination could be relevant in specific situations but do not directly satisfy the FAA's VFR fuel requirements for daylight cross-country flying. Thus, the requirement of having enough fuel to fly at least 30 minutes beyond your final destination is the specific safety guideline governing these flights.