Jason Sells Amy a Worthless Coin

Jason sells Amy a worthless coin. He incorrectly told Amy it 'belonged to an ancient Persian king and is of enormous value to coin collectors'. Economists would call this an

A) efficient exchange, assuming Jason was not intentionally trying to trick Amy.
B) inefficient exchange because externalities were involved.
C) efficient exchange since any type of voluntary exchange promotes efficiency.
D) inefficient exchange since at least one party used false market information.