Choose the most appropriate synonym of the highlighted word.
I have known you for a long time, and possess the most circumstantial details about the plans you were devising.

The correct answer is (a) Coincidental.
Explanation:
In this context, "circumstantial" means indirect or based on surrounding details rather than concrete facts. "Coincidental" fits as the closest synonym, meaning things that happen by chance or indirectly.
Hindi Meaning: परिस्थितिजन्य, घटनाओं पर आधारित
Synonyms: Incidental, Conditional, Contingent.
Antonyms: Direct, Definite, Certain.
Meanings of all options:
· Coincidental: Happening by chance; not planned.
· Certain: Definite; sure.
· Credible: Believable; trustworthy.
· Direct: Straightforward; without detours or ambiguities.
Correct sentence:
"I have known you for a long time, and possess the most coincidental details about the plans you were devising."