Forced migration can occur due to the following reason:
- Environmental disaster: This type of migration occurs when people are compelled to leave their homes due to natural disasters such as floods, earthquakes, or climate change effects.
The other options (greater employment opportunities, higher living standards, and political regime preference) typically do not constitute forced migration. While political regime preference might imply a push factor in some contexts, it usually involves more complex scenarios of persecution or violence rather than a straightforward reason for forced migration.