Answer:
cooperation and collaboration
B - Slave revolts.
The revolt of Spartacus, which was also the most famous slave uprising in the history of the Roman Empire, lead to questions about the usefulness and effectiveness of the current governmental system in Rome. This, along with other factors, made them plunge into a crisis which ended through the transition to an empire.
I found that it's "<span>Entrepreneurs earn profits when consumers buy products at prices high enough to cover their production costs." I hope this helps!</span>
