Come to a head means reach a crisis or decisive point. 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: Come to a head can refer to a situation involving reach a crisis or decisive point.
• Story example: A writer may use Come to a head when describing a situation involving reach a crisis or decisive point.
• Exam example: When a sentence contains Come to a head, choose the meaning “reach a crisis or decisive point.”