Answer:
d. a mutual legal assistance treaty request filed with the BVI seeking all beneficial ownership records.
Step-by-step explanation:
A request for a mutual legal assistance treaty filed in the British Virgin Islands, seeking all beneficial ownership records, would be the best document to be used by the financial investigator in this case.
This is because these documents have the necessary information so that the assets available for paying outstanding debts and restoring victims are correctly and efficiently identified.