In "the adventure of the blue carbuncle," what makes sherlock holmes certain that the owner of the hat and the goose will respond to a newspaper ad?
a. holmes knows that the man has responded to several newspaper ads in the past.
b. holmes knows that the man will want to meet the famous detective who placed the ad.
c. holmes knows that the man will want to peterson for saving him from being mugged.
d. holmes knows that the owner is a poor man who wants both his hat and his goose back.