acerbic : bitter ::
  1. anachronistic : archaic
  2. affluent : indigent
  3. impromptu : rehearsed
  4. incendiary : conciliatory
Explanation
Answer: Choice (A) is correct.

Acerbic means bitter, harsh, or severe, so the first half of the analogy is synonymous. So, look for the answer choice that contains synonyms. Choice (B) is incorrect, because affluent means wealthy or prosperous, and indigent means poor or penniless. Choice (C) is incorrect, because impromptu means unplanned or improvised, not rehearsed. Choice (D) is incorrect, because incendiary means inflammatory, and conciliatory means to pacify or reconcile. All of the answer choices except (A) are antonyms. Choice (A) is correct because anachronistic and archaic are synonyms for outdated or obsolete.
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