Question: who played arnold in hey arnold the jungle movie
[{'answer': 'Mason Vale Cotton', 'provenance': [{'wikipedia_id': '51720506', 'title': 'Hey Arnold!: The Jungle Movie', 'start_paragraph_id': 4, 'start_character': 52, 'end_paragraph_id': 4, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '51720506', 'title': 'Hey Arnold!: The Jungle Movie', 'start_paragraph_id': 4, 'start_character': 33, 'end_paragraph_id': 4, 'end_character': 425, 'bleu_score': 0.722771240912752, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17919053281105006142}, 'section': 'Section::::Plot.\n'}]}]