By dint of means by means of hard effort or a particular method. 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: By dint of can refer to a situation involving by means of hard effort or a particular method.
• Story example: A writer may use By dint of when describing a situation involving by means of hard effort or a particular method.
• Exam example: When a sentence contains By dint of, choose the meaning “by means of hard effort or a particular method.”