In "The Adventure of the Blue Carbuncle," when James Ryder tells Sherlock Holmes his real name, Holmes mentions that Ryder is the head attendant at the Metropolitan Hotel. What is one implication of Holmes saying this in the story?
a. It suggests that Holmes learned who worked at the hotel at some point before this because he suspects that a hotel employee was involved with the crime.
b. It frightens Ryder greatly, leaving him no choice but to go with Holmes and Watson back to Holmes's house in the hopes of retrieving the stolen jewel.
c. It indicates that Holmes has already figured out how and why Ryder chose to hide the stolen jewel in one of the geese raised by his sister.
d. It makes Holmes's decide to let Ryder go free rather than have him arrested, since Ryder promises not to commit any further crimes.