{"answers": "D", "options": ["f : if it also takes an hour to take the subway , i suggest we take the bus instead .", "f : that 's convenient if we just need 45 minutes to get there by subway . we can save 10 minutes .", "f : the way to the underground station is far away from the office so we need 50 minutes to get there by subway .", "f : then let 's take subway to the art center , since it just takes us 45 minutes ."], "article": "f : the street is so crowded . it will take about one hour to the art center if we take a bus . m : the underground station is next to the office . it 'll save 15 minutes .", "id": "train_6787"}