It happened because the consuls only cared about their own personal wealth and not for the people. The senate got richer and richer while the people got poorer and poorer. It ended with the rise of the Empire and the rule of an Emperor. The disadvantage was that all of the power was in the hand of a single person and often the Roman emperors were tyrannical.
The correct answer is D, domestication of animals. All other alternatives refer to events that only happened later.
In order to affirm an Agricultural Revolution ocurred, historians have to choose the most important changes and events that determine that from that moment onwards life was different.
The most important thing that supports the idea of an Agricultural Revolution is that humans started to domesticate plants and animals, which made possible for them to settle and stop being nomads.
This lead to the birth of cities and to radically change how those people lived.
The Stamp Act of 1765 required the colonists to place a stamp on all paper goods (legal documents, newspapers, playing cards, etc.). However, the catch to the stamp was that you had to buy it, which the profits went directly to the king of England. If you didn't pay for the stamp, then you were also taxed. It was a lose-lose situation for the colonists.
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