The correct answer is Option (1) → at
- "At war" is a commonly used phrase to indicate a state of conflict or fighting. It emphasizes being engaged in warfare.
- The other options are not grammatically or contextually appropriate:
- "In war" is less commonly used and may suggest a general involvement rather than active engagement.
- "On war" is incorrect.
- "Of war" is used in different contexts, such as "songs of war" or "memories of war," but not for describing the state of being at war.
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