The Presence of Skulls with Elongated Shapes Found in Australian

The presence of skulls with elongated shapes found in Australian burial sites indicates what about native Australian communities?

A) Communities of people sought to distinguish themselves from one another through visual cues.
B) Due to their genetic isolation from the rest of the world, native Australians developed distinctive features.
C) Many native Australians died young due to genetic abnormalities.
D) Native Australians often ritually killed those individuals with genetic defects.