A. Astute
B. Credulous
C. Trustful
D. None of these
🧠 Explanation:
The antonym of “gullible” (easily fooled) is “astute” (shrewd, not easily fooled). Antonyms improve English vocabulary by showing opposites. In Pakistan, they’re used in debates or exams to express ideas precisely, helping students and professionals communicate smartly in discussions or writing.
