D is the answer so its correct and your welcome
Paper currency or banknotes are pieces of paper that carry a payment promise for the currency written on them and which is payable to the bearer on demand. At the beginning, banknotes were issued by commercial banks that backed their value by holding reserves of gold and silver coins. Nowadays, its value is fiduciary, it is not backed by any physical good of the same value.
The development of paper currency by Song's dinasty meant a considerable improvement from merchants and traders at those times. Paper money was much easier to transport if compared to coins, both in terms of size and weight. Merchants could travel for a longer time carrying their profits with them on the way and became more efficient in their businesses.
The Revolutionary War in America.
Answer:
Longitudinal research
Explanation:
Longitudinal research is also called an observational study method. In this research, the data is gathered on the same population over some time. Longitudinal study as the name indicated run for a long-time period or a decade. In this study, the same individual is observed for a long period.
For instance, a study was conducted on aging in which around five thousand people were part of the study between the age of 45 to 85 for 20 years,
Thus Dr. Edward used a longitudinal study to conduct his research.
Answer:
probation or parole officer.
