Which of these passages from the house of the seven gables contains a metaphor?

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.

b) all hens are well worth studying for the piquancy and rich variety of their manners; but by no possibility can there have been other fowls of such odd appearance and deportment as these ancestral ones.

c) in compliance with a whim of clifford, as it troubled him to see them in confinement, they had been set at liberty, and now roamed at will about the garden; doing some little mischief, but hindered from escape by buildings on three