Step 1: Concept The Present Continuous tense is used for actions happening at the exact moment of speaking.
Step 2: Meaning The word "Listen" acts as a command or exclamation that draws attention to a current, immediate action.
Step 3: Analysis Because the speaker is telling someone to listen *now*, the knocking must be happening *now*.
Step 4: Conclusion The progressive form "is knocking" correctly conveys this immediate present action.
Final Answer: (D)
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