As good as one's word means keeping a promise. 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: As good as one's word can refer to a situation involving keeping a promise.
• Story example: A writer may use As good as one's word when describing a situation involving keeping a promise.
• Exam example: When a sentence contains As good as one's word, choose the meaning “keeping a promise.”