What safety concern arises with the center of gravity of stacked cargo moving away from the backrest?

When the center of gravity of stacked cargo moves away from the backrest of a forklift, it creates a significant safety concern because this situation can lead to a loss of stability. The backrest is designed to support the load and maintain the balance of the forklift and its cargo. When the load's center of gravity shifts too far forward, the risk of tipping over increases, especially during maneuvers like turning or braking. This shift can destabilize the forklift and make it more likely to tip, resulting in potential accidents or injuries.

In contrast, options that suggest safe operation, improved stability, or increased load capacity do not align with the consequences of moving the center of gravity too far from the backrest, as these scenarios would actually exacerbate the risk of instability and unsafe operation. Understanding the relationship between the center of gravity and the forklift's backrest is essential for safe handling and operation of forklift trucks.