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A longer moment arm is advantageous when lifting objects because it effectively decreases the amount of force needed to lift a load. The moment arm is the perpendicular distance from the line of action of the force to the pivot point or fulcrum. When the distance increases, the same amount of torque can be generated with a smaller force. This principle is rooted in the mechanics of levers; the longer the lever arm, the less effort is required to lift the burden.

For example, if you are trying to lift a heavy object with a lever, placing your fulcrum closer to the load means you have to apply more force to lift it. Conversely, moving the fulcrum farther away decreases the force needed to lift the same load, as you are able to use the longer distance to your advantage to create torque.

In this case, the other options do not align with how a moment arm functions in lifting. Increasing resistance would mean that more force is needed, while increasing the weight would necessitate even greater force to lift the object. Stabilizing the load refers to maintaining balance and does not pertain to the physics of reducing the force required for lifting. Thus, decreasing the required force due to a longer moment arm is the correct and fundamental principle behind