Select the option that is related to the third word in the same way as the second word is related to the first word. (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.)
Lethargy : Alertness :: Gentle : ?

Correct option is D

Given:
Select the option that is related to the third word in the same way as the second word is related to the first word.
Lethargy : Alertness :: Gentle : ?
Logic:
The relationship is based on antonyms (opposite meaning):
Lethargy (laziness) ↔ Alertness (active state, opposite meaning).
Gentle ↔ Opposite word = Harsh.
Explanation:
Gentle means soft, mild, polite.
Its opposite is Harsh (rough, severe).
Other options are not strict antonyms.
Final Answer:
The correct word is Harsh.
Final Correct Option:
(D)