In which of the following situations would Defendant's mistake most likely constitute a defense to the crime charged?
A local ordinance forbids the sale of alcoholic beverages to persons under 18 years of age. Relying on false identification, Defendant sells champagne to a 16-year-old high school student. Defendant is charged with illegal sale of alcoholic beverages.  Mistaking Defendant for a narcotics suspect, an undercover police officer attempts to arrest him. Defendant, unaware that the person who has grabbed him is an officer, hits him and knocks him unconscious. Defendant is charged with assault.  Defendant, aged 23, has sexual intercourse with a 15-year-old prostitute who tells Defendant that she is 18. Defendant is charged with the felony of statutory rape under a statute that makes sexual relations with a child under 16 a felony.  Relying on erroneous advice from his attorney that, if his wife has abandoned him for more than a year, he is free to marry, Defendant remarries and is subsequently charged with bigamy.