B
@Baller B
Agree with what u wrote too, but I'm not convinced the black goo is a germ or weapon, simply because the engineer at the beginning of the film drinks it to sacrafice himself to create life. The black goo reacts to each individual differently so its true purpose is unknown.
Also we don't know what the engineers were running from that killed them, everyone assumes its the black goo the truth is we really don't know we just know they died 2000 years ago.