In "The Adventure of the Blue Carbuncle," which best describes John Horner? A. a logical and intelligent person who is impressed
by Sherlock Holmes's powers of deduction B. a poor man who tries to do something nice for his wife, but ends up being robbed C. a plumber who has been convicted of robbery before but who is innocent in this case D. a wealthy man who loses a very valuable item to a cunning thief
