Answer: A) soft : loud.
Explanation: an analogy is a comparison between one thing and another, usually with the purpose of explanation or clarification, this comparison is based on one similarity or difference between specific features of two things. The first pair of the given analogy is "adrift" and "anchored" this words are antonyms, so the pair that completes the analogy should be formed by antonyms too, so for this reason the correct answer is option A: soft and louds are antonyms as well.
