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The correct statement regarding fuel requirements before takeoff emphasizes the necessity for an aircraft to have sufficient usable fuel to cover the entire planned flight, including reserves. This is crucial for ensuring safety and compliance with aviation regulations. The reserves are designed to manage unforeseen circumstances, such as delays or diversions that may require additional fuel.

Regulatory guidelines typically mandate that aircraft maintain a reserve fuel quantity, which allows for continued flight under various scenarios, ensuring the aircraft can safely reach its destination or an alternate in the event of an emergency. Therefore, having enough fuel for the main flight path plus the specified reserve fuels is essential to mitigate risks associated with fuel shortages.

In contrast, the other options do not adequately address these critical safety requirements, as they either imply insufficient fuel management or fail to account for the necessary reserves for safe flight operations.