Which of the following would be the most appropriate title for this text ________.
·Why has Crime iAmerica Declined since the 1990s
·How the Decline of Cash Makes America a Safer Country
·The Impacts of the Decline of Cash iAmerica
·The Relations betweeCash and Crime

单选题
·Cash is the lifeblood of the black market.
·it offered a randomly controlled environment. 　
·a decline in crimes related to the use of cash.
·the government is advised to advocate cashless payments.
·How the Decline of Cash Makes America a Safer Country