Answer:
B. public.
Explanation:
Antonyms are the words that have the opposite meaning of a given word. This means that whatever word is given, the opposite of that word is the antonym of it.
The given word "classified" is used to talk of something that is kept secret, hidden, or done discretely. So, the opposite of discreet is open, known, public.
Thus, the correct answer is option B.
