Answer:
The correct answer is corruption and war
Step-by-step explanation:
All other options except the first one led to the crisis and problems connected to economy, but on the other side didn't led to the destruction of those countries. Still, on the other side what was known to all mentioned countries was corruption. That led to internal crisis that were finished with the invasion of outsiders. The best example for that is Egypt, as Old, Middle and then New Kingdom disappeared in wars.