A fool's paradise means a state of false happiness based on wrong hopes. This answer is correct because the expression has a fixed figurative meaning in English. In an SSC idiom question, students should match the whole phrase with its accepted meaning rather than translate each word separately.

• Classroom example: A fool's paradise can refer to a state of false happiness based on wrong hopes.
• Story example: A writer may use A fool's paradise when describing a state of false happiness based on wrong hopes.
• Exam example: When a sentence contains A fool's paradise, choose the meaning “a state of false happiness based on wrong hopes.”