Core concept: Vocabulary - synonym identification in context. Key analysis: 1. 'Alleviated' means to make suffering or a problem less severe 2. 'Mitigated' (C) directly matches this meaning 3. Error analysis: - A/B are antonyms (worsening effects) - D refers to improvement but not specifically to reducing negative impact 4. Common mistake: Confusing 'enhance' (improve quality) with crisis reduction