Select the word-pair that best represents a similar relationship to the one expressed in the pairs of words given below. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters / number of consonants / vowels in the word.)
Docile : Defiant, Placid : Turbulent

Correct option is C

The relationship between Docile : Defiant and Placid : Turbulent is one of opposites or antonyms. Docile (calm and submissive) is the opposite of defiant (rebellious), and placid (calm) is the opposite of turbulent (chaotic).
Let’s evaluate the options for similar pairs:
Optimal : Ideal – These words are synonyms, not opposites.
Scrumptious : Delicious – These words are also synonyms, meaning tasty.
Zenith : Nadir – These are opposites, as zenith refers to the highest point and nadir refers to the lowest point.
Relinquish : Surrender – These words are synonyms, meaning to give up or let go.
The pair Zenith : Nadir best represents the opposite relationship, similar to Docile : Defiant and Placid : Turbulent.
Correct Answer: (c) Zenith : Nadir