Explanation:

- Interrogate: This word means to question someone closely or aggressively, often in a formal or official context.

- Option 1 - Meditate: This means to think deeply or focus one's mind for a period of time, often in silence or with the aid of chanting, for religious or spiritual purposes or as a method of relaxation.

- Option 2 - Answer: This refers to a response or reply to a question, which is usually the result of being interrogated.

- Option 3 - Investigate: To carry out a systematic or formal inquiry to discover and examine the facts, often involving questioning.

- Option 4 - Delay: This means to make something late or slow, unrelated to questioning or inquiry.

Correct Answer: Option 3 - Investigate is the most appropriate synonym for "interrogate," as both involve a form of inquiry or questioning.

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