C.The obvious problem that is being avoided✓ Correct
D.The prized possession in the room
Explanation
The idiom 'elephant in the room' refers to an obvious problem or controversial issue that everyone is aware of but no one wants to discuss or acknowledge. It denotes an avoided but significant topic. While 'the important topic' might seem close, the key element is the deliberate avoidance, not mere importance. Hence, 'The obvious problem that is being avoided' is the most accurate meaning.
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