You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

They are a mysterious relative of the Neanderthals who are thought to have roamed the plains of Siberia and east Asia long before modern humans arrived on the continent. But little is known about the Denisovans, a sister species of the Neanderthals who first emerged around 200,000 years ago, as so few of their fossilised remains have been discovered. Now researchers have unpicked a tiny piece of the puzzle about how this enigmatic human species lived - they regularly inhabited the same caves. Using pioneering DNA analysis of teeth and a fragment of pinky finger bone found at the Denisova cave in Altai Krai, in the Altai Mountains near Barnaul, Russia, the researchers have discovered they belonged to three individuals who lived there tens of thousands of years apart.Geneticists studied DNA from teeth and a pinky bone from a Siberian caveThey were found to belong to individuals living thousands of years apartIt has provided clues about how this mysterious human species livedThe Denisovans are thought to be a sister species of the Neanderthal 
 Questions:'Moreover, we find that nuclear diversity among the four _ is higher than among seven Neanderthals for which nuclear DNA have previously been recovered. (A) Neanderthals (B) Siberia (C) Asia (D) Denisovans (E) DNA (F) Altai Krai (G) Altai Mountains (H) Barnaul (I) Russia (J) Siberian (K) Neanderthal
Output:
(D)