Answer:
II and III
Step-by-step explanation:
Ethnic conflict means the nation as a whole is unstable, and this can mean that governments don't last long or there is a power struggle between 2 or more very powerful dictator-like figures.
Terrorism can also destabilize a nation. It can make some people feel like their current government is not doing enough to stop the problem, especially in smaller less developed countries. This can lead to an uprising or revolution in the nation and can lead to the establishment of a dictatorship.