while Earth's continents were joined while Earth's habitats were stable before major climatic changes following mass extinctions
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: According to the fossil record, when did episodes of rapid speciation commonly take place?
Possibilities:
- while Earth's continents were joined
- while Earth's habitats were stable
- before major climatic changes
- following mass extinctions

following mass extinctions