At issue means the main point being discussed or disputed. 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: At issue can refer to the main point being discussed or disputed.
• Story example: A writer may use At issue when describing the main point being discussed or disputed.
• Exam example: When a sentence contains At issue, choose the meaning “the main point being discussed or disputed.”