Concept:Structures in technology are designed primarily to support loads and resist forces without collapsing, which improves their stability.Explanation:A structure is a framework of parts arranged to bear weight and withstand external forces such as wind, pressure, or movement.By distributing these forces safely, the structure prevents deformation, tipping, or failure.Thus, the main purpose of a well-designed structure is to increase its stability under load.Answer:B. increase stability.