What did firefighters report immediately after the collapse?

The response indicating a rumbling sound and flames erupting captures the chaotic and alarming nature of a building collapse during firefighting operations. Firefighters often rely on their senses and immediate observations in such high-stress situations. The report of a rumbling sound suggests impending danger or instability in the structure, which is critical for assessing the situation and making rapid decisions about safety and strategy.

Additionally, the mention of flames erupting indicates that even before or during the collapse, there may have been ongoing fire activity that contributed to the building's failure. This aligns with common scenarios in firefighting, where structural integrity can be compromised due to fire damage.

Other choices, while they express important emotional responses or environmental conditions, do not provide the same level of immediate, situational awareness that firefighters need right after a collapse. They focus more on the aftermath or emotional state rather than the direct observations and sounds that indicate a critical incident unfolding.