Bad blood means angry or bitter feelings between people. 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: Bad blood can refer to a situation involving angry or bitter feelings between people.
• Story example: A writer may use Bad blood when describing a situation involving angry or bitter feelings between people.
• Exam example: When a sentence contains Bad blood, choose the meaning “angry or bitter feelings between people.”