Push Factor in Migration: Push factors are conditions or circumstances in a person's current location that encourage or force them to leave. They are often negative aspects of their current situation that make staying there undesirable. In the context of natural disasters, the following elaboration applies:

 Natural Disasters:

• Natural disasters include events like earthquakes, floods, hurricanes, tornadoes, droughts, wildfires, and tsunamis. These catastrophic events can have severe and immediate impacts on communities, leading to damage and loss of life, property, and livelihoods.
• After experiencing a natural disaster, people often face difficult conditions such as destruction of homes, loss of crops, and inadequate access to clean water, food, and healthcare. This can make their current location uninhabitable and untenable.

THEREFORE THE CORRECT OPTION IS [3].