Answer: A) … the brackish water itself, however nauseous to the rest of the world, was so greatly esteemed by these fowls, that they might be seen tasting, turning up their heads, and smacking their bills, with precisely the air of wine-bibbers round a probationary cask.
Step-by-step explanation: A metaphor is a comparison between elements that aren't obviously related, it is often used to create an image in the reader's mind, it doesn't use the words "like" or "as" to make the comparison. From the given passages from "The House of the Seven Gables" the one that contains an example of a metaphor is option A, in the phrase "with precisely the air of wine-bibbers round a probationary cask" the speaker is comparing the fowls with wine-bibbers.