What does MSA guarantee in terms of altitude?

The Minimum Safe Altitude (MSA) is designed to ensure aircraft operate at a safe height above the highest terrain and obstacles in a given area, providing a buffer for emergency situations and navigation. Specifically, the MSA guarantees an altitude that is at least 1000 feet above the highest obstacle within a certain distance from the intended flight path, usually within a 5-mile radius. This safety margin is crucial for both visual and instrument flight operations, as it mitigates the risks of obstacle collision. Therefore, choosing 1000 feet above the highest obstacle is the correct answer, as it aligns with the established standards that prioritize safety for aircraft operating in various environments.