ऑस्ट्रेलिया ने
General competitive examinations frequently test candidates on Current Affairs topics. Questions like "हाल ही में किस देश ने लुप्तप्राय कोआला प्रजाति को ..." are designed to verify factual recall and general awareness. Regular practice on similar MCQs ensures a higher accuracy rate. The correct option here is ऑस्ट्रेलिया ने.