A laughing stock means a person or thing that others laugh at. 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 laughing stock can refer to a person or thing that others laugh at.
• Story example: A writer may use A laughing stock when describing a person or thing that others laugh at.
• Exam example: When a sentence contains A laughing stock, choose the meaning “a person or thing that others laugh at.”