In which of the following situations is the defendant most likely to be convicted of burglary?
A. Unreasonably mistaking Walter's briefcase for his own, Defendant removes the briefcase from Walter's office and takes it home, placing it in his hall closet.
B. Believing that it is not illegal to take a relative's property, Defendant enters his brother's home through an unlocked door while his brother is sleeping and takes his $ 2,000$ television set. Defendant later sells the set at a flea market. 
Choose A, B, C or D as your solution.
B