In litigation over whether an uncle conveyed a parcel of land to his nephew, the nephew wishes to offer into evidence a tape recording of his uncle made by a well-known oral historian at the nearby state university. The voice on the tape is discussing various conveyances of the parcel of land and other property owned by the uncle. The nephew wishes to have the historian testify that the voice on the tape is the uncle's. If the court allows the historian to testify, it will be because:
A. The historian is testifying regarding an admission by a party-opponent.
B. The historian has heard the uncle speak before.
C. The historian became familiar with the uncle's voice before the dispute over the property arose.
D. The historian's experience as an oral historian qualifies him as an expert in voice recognition.