{"answers": "B", "options": ["m : this book is $ 3.50 for a copy , and you 'll pay $ 10 for three .", "m : you want to take three books ? then you need to pay 30 dollars for them .", "m : you need to pay $ 20 for two as this book costs $ 10 .", "m : the book costs 15 dollars . you need to pay 30 dollars for two ."], "article": "f : how much is the book ? m : $ 10 each . f : i 'd like to buy three of them .", "id": "train_4407"}