The expansion led to <span>the invention of a money system.
The expansion allowed many traders from China to exchange goods and services with traders from other nations.
In order to make trading process became fairer to both sides, a money system is needed as a form of valuation on a certain products/services.</span>
Taxes can be used to provide citizens services, as well as pay for costs of running the government and what they are governing over. For instance, tax dollars pay for military and roads to be kept. Without tax dollars, where would the money come to pay for roads and our military?
I believe that the answer is b, because he is a German engineer and the process was named the Siemens-martin process
