MSA stands for minimum safe altitude, providing at least 1,000 feet of obstacle clearance. Which option lists this acronym?

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Minimum Safe Altitude is the term for an altitude that provides a guaranteed obstacle clearance, typically about 1,000 feet, within a defined area around a navigational aid. Because the statement ties 1,000 feet of obstacle clearance to the acronym, the one that matches is the one for Minimum Safe Altitude. The other terms refer to different aviation concepts—one relates to runway height measurements and another to the point where a missed approach is started—so they don’t describe this obstacle-clearance protection.