In "the adventure of the blue carbuncle," which best describes henry baker?

a.
a logical and intelligent person who is impressed by sherlock holmes's powers of deduction

b.
a plumber who has been convicted of robbery before but who is innocent in this case

c.
a poor man who tries to do something nice for his wife, but ends up being robbed

d.
a wealthy man who loses a very valuable item to a cunning thief