Read this sentence from "The Cask of Amontillado" by Edgar Allan Poe:

In painting and gemmary, Fortunato, like his countrymen, was a quack, but in the matter of old wines he was sincere.

What does the word quack likely mean?

A.
a person who talks loudly and ignorantly
B.
an unskilled person who claims special knowledge in a specific field
C.
a person who gossips about friends and acquaintances
D.
a person who is boastful about very minor accomplishments