Which sentence should appear first in an effective summary of Part 2 of "The Adventure of the Blue Carbuncle"? A. Holmes and Watson set out to find the salesperson at Covent Garden to try to solve the case and to make sure an innocent man is not punished for the theft

B. Holmes and Watson learn from the innkeeper that goose in question was purchased from a salesperson working in Covent Garden

C. The owner of the hat, Henry Baker, pays a visit to Holmes after spotting the advertisement in the newspaper and Holmes determines he knows nothing of the gem hidden in the goose
D
. To figure out how the gem came to be inside the goose, Holmes and Watson visit the innkeeper who sold the goose to Baker.