The correct answer is Option (1) → interfere
The completed sentence is:
"He has a terrible habit of always trying to interfere in things that are not his business."
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Interfere: This means to involve oneself in a situation where one is not wanted or has no authority. It fits perfectly in the context of the sentence.
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Interview: This means to ask someone questions, especially in a formal setting. It does not fit the context of trying to involve oneself in other people's business.
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Internalise: This means to make something an integral part of one's beliefs or feelings. It does not relate to the context of interference.
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Interpret: This means to explain the meaning of something. It also does not fit the context of interfering in someone else's business.
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