trenchant : acerbic ::
  1. intrepid : fearless
  2. savory : distasteful
  3. sporadic : regularly
  4. tremulous : unwavering
Explanation
Answer: Choice (A) is correct.

In the first half of the analogy, trenchant and acerbic are both words that refer to something sharp or cutting - like a biting wit. So, look for the answer choice that contains synonyms. In choice (B), something that is savory is pleasing or delicious in flavor, not distasteful, so eliminate that choice. In choice (C), something that is sporadic is intermittent, not regular, so eliminate that choice. In choice (D), something that is tremulous is shaky, not unwavering, so eliminate that choice. The choice that contains synonyms is (A). Someone who is intrepid is without fear, so that is the correct choice.

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