I think the Costal Plains if I am correct
The Industrial Revolution transformed economies that had been based on agriculture and handicrafts into economies based on large-scale industry, mechanized manufacturing, and the factory system. New machines, new power sources, and new ways of organizing work made existing industries more productive and efficient.
The fall of Ancient Rome started from about AD 190. The Roman Empire was attacked by tribes such as the Goths and the Vandals. Civil wars in parts of the empire further weakened the rule of Rome and respect for Roman law dwindled as a result.
Answer:
3. Chinas transition to a market economy
I think it is B. because the open-door policy in China allowed economic growth at the fastest sustained rate between 1980 and the early 2000s than any other country. The Open-door policy refers to the foreign affairs toward the United States' policy that has been established.