Convert the given sentence into active/passive voice. **Change the following from active to passive: Policy advisors had extensively debated the implications of the reform during negotiations.**

Options:

• A: The reform implications were being debated by the policy advisors during negotiations.
• B: Reform implications had been debated by advisors during negotiations.
• C: The implications had been under debate by advisors during negotiations.
• D: The implications of the reform had been extensively debated by policy advisors during negotiations.

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