Interesting : Repulsive :: Intricate :
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Unrefined
The first pair are opposites: something interesting draws you towards it, something repulsive drives you away. So the answer must be the opposite of intricate, which means made of many fine, detailed and carefully worked parts (an intricate carving). Its opposite is plain, rough and crude, that is, unrefined.
Why the other options are incorrect
Option (1) Proud — Incorrect. It means having a high opinion of oneself and says nothing about how detailed a thing is.
Option (2) Brave — Incorrect. It means showing courage, a quality of a person, not of a design.
Option (3) Humble — Incorrect. It is the opposite of proud, not of intricate.