Back to basics means returning to simple and important principles. 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: Back to basics can refer to a situation involving returning to simple and important principles.
• Story example: A writer may use Back to basics when describing a situation involving returning to simple and important principles.
• Exam example: When a sentence contains Back to basics, choose the meaning “returning to simple and important principles.”