How Did Graduate Students of Anthropology from Across the Country

How did graduate students of anthropology from across the country help to solve the notorious Pickton farm murder case in British Columbia?

A) They developed facial recognition software to compare photographs with skeletal remains.
B) They excavated and sifted tons of dirt to look for traces of human remains and clues.
C) They helped develop criminal profiles to identify characteristics of the killer.
D) They excavated the machinery used to dispose of bodies.