Lame excuse means a weak or unconvincing reason. 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: Lame excuse can refer to a weak or unconvincing reason.
• Story example: A writer may use Lame excuse when describing a weak or unconvincing reason.
• Exam example: When a sentence contains Lame excuse, choose the meaning “a weak or unconvincing reason.”