The answer would be b, emigration because emigration means to leave an area to go to another one, and all those factors would result in the animals leaving.
Limiting factor can be define as the condition which restricts or limits the growth, abundance and distribution of a species in an ecosystem. Flooding, wildfire, landslide and climate change are the examples of the limiting factors. The emigration is the correct option because of the fact that animals in order to protect themselves from these environmental factors would likely to vacate their habitat and they will move to the other location.
You need to give us the text, how would we know what to answer if we don’t know what text were reading. All I can help you with so far is to reread the text and see what the author says
