The correct answer is A) increased long-distance trade and taxation of citizens.
The activity that is an economic characteristic of classical civilizations is "increased long-distance trade and taxation of citizens."
We are talking about economic activities, not political or military. So the correct answer is"increased long-distance trade and taxation of citizens." Trade and taxation were two of the most important components of classical civilization such as China or Greece. These elements served to increase the economic presence and political power of the empires. If the economy of the empire was good, the government could improve other areas such as the military.
