The 150 pound people that jumped from the towers as the flames blistered their bodies , made bigger craters than this six ton engine when their chests and brains exploded on the concrete below .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason they jumped ?
Options:
- The window collapsed .
 - The building collapsed .
 - The engine collapsed .
 - The plane collapsed .


The building collapsed .