Genetic diversity in the dominant species of the region
Species endemic to the region
Biodiversity is the term popularised by the sociobiologist Edward Wilson to describe the combined diversity at all the levels of biological organization. Diversity in the organisms living in the region is represented by the biodiversity of the geographical region. It includes the endangered species, genetic diversity, endemic species of that region. For example, the continent of Africa is home to tropical rainforests, alpine mountains, and dry deserts.
So, the correct answer is 'Diversity in the organisms living in the region'.