At one's own risk means with responsibility for any danger or loss. 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 one's own risk can refer to a situation involving with responsibility for any danger or loss.
• Story example: A writer may use At one's own risk when describing a situation involving with responsibility for any danger or loss.
• Exam example: When a sentence contains At one's own risk, choose the meaning “with responsibility for any danger or loss.”