Answer:
Human life advances.
Explanation:
If there is development, then, humans would want to use the development, and in that way they are going to advance.
The answer would be Greece (a)
All of the following are caste classes (Brahmins - priests, Kshatriyas - soldiers and administrators, and Vaishayas - merchants) except for B. untouchables, who were completely excluded from the caste system.
The correct answer is the plow. When the plow was invented agriculture was made much easier which enabled people to settle around and make surplus of food. This enabled them to trade with others and increase the size of the cities and the rest is history.
