Question: who provided the voiceover for darth vader in the original star wars trilogy
[{'answer': 'James Earl Jones', 'provenance': [{'wikipedia_id': '991844', 'title': 'David Prowse', 'start_paragraph_id': 1, 'start_character': 285, 'end_paragraph_id': 1, 'end_character': 301, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '991844', 'title': 'David Prowse', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 596, 'bleu_score': 0.9463989069388911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18380721423128817855}, 'section': 'Section::::Abstract.'}]}]