Go a long way means be very helpful or effective. 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: Go a long way can refer to a situation involving be very helpful or effective.
• Story example: A writer may use Go a long way when describing a situation involving be very helpful or effective.
• Exam example: When a sentence contains Go a long way, choose the meaning “be very helpful or effective.”