How did the ancient Roman Republic begin?

a)The Romans overthrew the Etruscans, who had ruled for over one hundred years.

b)The Romans held a referendum to vote on the type of government they would have.

c)The Romans finally defeated the Persians, after fighting for control of Rome for many years.

d)A small group of Roman nobles and scholars decided that Rome should be a republic.

Question

How did the ancient Roman Republic begin?
		
a)The Romans overthrew the Etruscans, who had ruled for over one hundred years.
		
b)The Romans held a referendum to vote on the type of government they would have.
		
c)The Romans finally defeated the Persians, after fighting for control of Rome for many years.
		
d)A small group of Roman nobles and scholars decided that Rome should be a republic.