'sweet' and 'pungent' are a) antonyms. b) homophones. c) similes. d) synonyms.

B) Antonyms, because sweet means “having the pleasant taste characteristic of sugar or honey; not salty, sour, or bitter.” while pungent means “having a sharply strong taste or smell.” So, they are antonyms.

c. barbarians with unexpected intelligence  

(you didn't attach a copy of the poem, but i'm answering as best as i can)

since a simile compares two unlike things using like or as, it kind of gives an item the ability to do something it can't.

example: "the player was like a tiger on the field"

in this sentence, the simile conveys the idea that the player was fast and strong, like a tiger.