The correct answer is option B. New, more adaptable species flourish, replacing the extinct species.
The mass extinction is the rapid extinction of many species due to a major changes in the atmosphere they live in. The species that extinct in the mass extinction cannot reflourish on the same land. After the mass extinction, new species with adaptable characters are evolved. These new species are well adapted to the conditions that exist after extinction, hence, they completely replace the species existed before. These species are not similar to the old species, as the characteristics of the old species does not suit the environment after extinction.