HELP PLEASE I NEED TO FINISH THIS UNIT TEST REVIEW Read the passage.

It remains to be explained why Ötzi's maternal lineage [mother’s family line] has disappeared, while his paternal lineage [father’s family line]—named G2a—still exists in Europe. To clarify this point, researchers at EURAC compared Ötzi's . . . DNA . . . with available data from numerous ancient samples found at 14 different archaeological sites throughout Europe. The results showed that the paternal lineage of Ötzi' was very common in different regions in Europe during the Neolithic Age, while his maternal lineage probably existed only in the Alps.

–"New Discoveries Concerning Ötzi's Genetic History,” European Academy of Bozen/Bolzano (EURAC)

What is the central idea of this passage?

Ötzi lived during the Neolithic age.
The family line of Ötzi’s mother is very complex.
Ötzi’s DNA is too complex to study in a lab setting.
The family line of Ötzi’s father is common in Europe.