Chef: This mussel recipe's first step is to sprinkle the live mussels with cornmeal. The cornmeal is used to clean them out: they take the cornmeal in and eject the sand that they contain. But I can skip this step, because the mussels available at seafood markets are farm raised and therefore do not contain sand.

Question: Which one of the following is an assumption required by the chef's argument?
Options:
A. Cornmeal is not used to clean out farm-raised mussels before they reach seafood markets.
B. Mussels contain no contaminants other than sand.
C. Sprinkling the mussels with cornmeal does not affect their taste.
D. The chef's mussel recipe was written before farm-raised mussels became available.
E. The mussels the chef is using for the mussel recipe came from a seafood market.
Answer: "E"