(I) Gregarious
(II) Quixotic
(III) Sociable
(IV) Discernible

The correct answer is 'Option(1)' i.e. '(I) - (III)'.

Key Points

• The word "Gregarious" means fond of company; sociable. (मिलनसार, झुंड में रहने वाला)
  • Example: She is a gregarious person who enjoys meeting new people at gatherings.
• The word "Sociable" means willing to communicate or to engage in social activities; friendly and agreeable in company. (सामाजिक, मिलनसार)
  • Example: He is very sociable and makes friends easily wherever he goes.
• Hence, "Gregarious" and "Sociable" are most nearly the same in meaning (synonyms).

Therefore, the correct answer is- (I) - (III).

Additional Information

• Quixotic (आदर्शवादी, अव्यावहारिक): Exceedingly idealistic; unrealistic and impractical.
  • Example: His quixotic dream of ending all poverty in the world was admirable but unattainable.
• Discernible (पहचानने योग्य, प्रत्यक्ष): Able to be perceived or recognized.
  • Example: There was a discernible difference in her performance after she started practicing regularly.
• The combinations involving Quixotic and Discernible (Options 2, 3, and 4 in its original likely intended form) do not show a relationship of synonymy or antonymy.