The Unique Preservation of Soft-Bodied Fauna in the Burgess Shale

The unique preservation of soft-bodied fauna in the Burgess Shale occurred because ____.

A) animals and plants were carried by turbidity flows to aerobic deep-sea conditions
B) animals and plants were transported and buried in anaerobic conditions
C) scavenging  bacteria were able to destroy organisms at the burial site
D) predators consumed their soft parts, leaving the hard part behind
E) animals with hard parts were deposited immediately above the shale