Question: what was one goal of the marshall plan
[{'answer': 'rebuild war - torn regions', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 457, 'end_paragraph_id': 1, 'end_character': 482, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'remove trade barriers', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 483, 'end_paragraph_id': 1, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'modernize industry', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 506, 'end_paragraph_id': 1, 'end_character': 524, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'improve European prosperity', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 526, 'end_paragraph_id': 1, 'end_character': 553, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'prevent the spread of Communism', 'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 559, 'end_paragraph_id': 1, 'end_character': 590, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19766', 'title': 'Marshall Plan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 784, 'bleu_score': 0.795044793733193, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17786989053468665893}, 'section': 'Section::::Abstract.'}]}]