TOEFL Reading: ETS-TOEFL阅读机经 - 75RDP3D7Q1D0MML2L$

Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. The locations where coins are found can provide information about local trade practices, and the writing on the coins can indicate what kind of government issued them. B. Coins issued in ancient Greece and Rome and in medieval Europe are important sources of information about the role of writing at those locations. C. Kings and other rulers often used coins to record information about trade with other governments and about their personal lives. D. Coins became important in conducting trade transactions, and their inscriptions often indicate the locations where they were issued.