M：The paper money required little effort to carry.If you need large amount of money，you can use a check or credit card to make the payment. W：This nature of money is called portability and it provides convenience in settling transactions. Q：What does the word portability mean？（）
A．It means being convenient to be carried. B．It means being readily to be divided. C．It means being easily identified. D．It means being carried in a big basket.