Select the correct active/passive form of the given sentence. **The documents were believed to have been misplaced by the clerical staff.**

Options:

• A: The clerical staff were believed to misplace the documents.
• B: It was believed that the clerical staff misplaced the documents.
• C: The clerical staff had misplaced the documents, it was believed.
• D: It was believed that the documents were misplaced by the clerical staff.

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