Which feature could expose a building to collapse risks?

Prolonged exposure from fire can significantly compromise the structural integrity of a building, increasing the risk of collapse. When a building is subjected to high temperatures for an extended period, the materials that support its structure can weaken. Steel, for instance, can lose a significant amount of its strength when exposed to heat, leading to potential failure. Similarly, wood and other materials can become brittle or char which undermines their load-bearing capacity.

In contrast, proper ventilation systems and strong foundational support enhance safety and help mitigate risks associated with fire damage. New construction techniques may also improve a building's resilience depending on how they are implemented. Therefore, it is the prolonged exposure to fire that acts as a crucial factor in exposing a building to collapse risks.