Out of the four given words, two of them are either synonyms or antonyms of each other. Identify the correct pair.
This question gives four words, Limpid, Luscious, Acrid, and Benign, and asks us to find the two that form a matching pair, either as synonyms or as antonyms.
Comparing all six possible pairings, Limpid does not connect meaningfully with any of the other three, since clarity of a liquid or of thought has nothing to do with taste or gentleness. Benign also stands apart, since it describes harmlessness rather than a taste quality. Luscious and Acrid, however, both describe how something tastes or smells, one being pleasantly sweet and the other being harshly bitter, placing them at opposite ends of the same scale of taste. That opposite relationship makes them antonyms of each other.
Let's summarize:
The correct pair is Luscious and Acrid, so the answer is option (c), II and III.