Select the most suitable synonym from the given choices for the word:…

"Antediluvian" literally means "before the flood" (from Latin ante = before, diluvium = flood) and is used for anything extremely old, antiquated, or outdated.

"Archaic" means ancient, old-fashioned, or belonging to a much earlier period — the same sense of being very old and out of use. It is therefore the closest synonym among the choices.

"Maverick" (an unconventional, independent person) and "Bellicose" (aggressive or warlike) describe personality, not age, so neither is a synonym. The first choice merely repeats the headword itself.