A bridge too far means a goal or action that is too difficult or too ambitious. 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 bridge too far can refer to a goal or action that is too difficult or too ambitious.
• Story example: A writer may use A bridge too far when describing a goal or action that is too difficult or too ambitious.
• Exam example: When a sentence contains A bridge too far, choose the meaning “a goal or action that is too difficult or too ambitious.”