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Explanation:

This is an easy passage to read, but some of the questions have very close choices. This question asks to pick a choice that modern currency does not share with the currencies of the Tang era. You must remember that this is an EXCEPT question, and the feature not shared will become the right choice. 1 is a feature shared by both modern and Tang currencies. Last paragraph tells us about modern currencies, whereas the opening tells us about the Tang currencies. Choice 3 also is a feature shared by both, the bolt of silk lost value because of wear and tear. Now many might feel that the last paragraph does not speak anything about modern currencies losing value over time. But this is implied as common knowledge. The idea of inflation suggests that currency value my not always be the same always. The value of Rs 100 was greater 20 years ago than it is today. Thus 3 is a feature shared by both modern and Tang currencies. 4 is also a feature shared by both because in the modern times we use coins for smaller payments, currency for bigger payments, and electronic methods for still bigger payments. This was true of Tang era as well, as can be seen in the first and second paragraphs. The currencies during the Tang era were static: we had coins, fabric and grains to make payments; there is no transformation implied in these during that era, whereas in the modern times because of technology the currency system is undergoing transformation, as the last paragraph shows. The author says: it is changing in front of our eyes…

Hence, option (b) is correct.