This is a grammar-based sentence correction question. Even though the phrase accompanied by her brother appears plural, the main subject is singular (Tania). Hence, the correct verb is was.
Tania, accompanied by her brother _____ at the party.
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This question is part of 📚 General Knowledge within the broader 🌐 Current Affairs & GK subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.