In recipes, using measurements and scales.
in business, to find cost and revenue
in weather, to find the degree of temperature
in arts, to measure and draw with rulers
The use of standard currency/coins help the economy of the Roman Empire because Roman coins were often used as tools by Europeans to circulate various forms of news and propaganda to the people and the world.
The correct answer is "to make laws" - answer D. You can see that it's connected to the laws because it's also the name of one of the three branches of the government (the legislative branch) which is responsible for making laws. (the other two : judicial: to judge and executive: to actually govern)