You Find a New Fossil Deposit, Containing Many Species with Shells

You find a new fossil deposit, containing many species with shells but no soft-bodied species. What is the most likely reason for this?

A) Soft-bodied species were rare or absent at this time and location.
B) There was a mass extinction event among hard-bodied, but not soft-bodied, species at this location.
C) Conditions were not right to fossilize soft-bodied organisms.