Why did most states choose a bicameral over a unicameral legislature

Most states choose a bicameral legislature rather than a unicameral legislature because the objective to balance the power of the common people with that of the wealthy and well-educated is clearly evident. Bicameral legislature has a government with two lawmaking houses which are the Senate and the House of Representatives. Having a bicameral legislature gives the citizens some advantages. One is, this is applicable in federal states. This means that if the units are not equal in size or population, there is a chamber which will give balance to that inequality. It is in the second chamber that all states are equally represented irrespective of their size or population.  Second, after the bill has been passed in the first chamber, it will then proceed to the second for them to have a second look. When the second chamber finds that something is not right, it will go back to the first chamber for it to be corrected before it will continue to become a law. Another advantage is that a bicameral kind of government prevents dictatorship to rule. One chamber will check if everything is still on track.  The bicameral government also shows that since people with diverse backgrounds, experience and expertise are allowed to serve in the second chamber, the opportunity is open to a wide range of people to take part in the government. 

i think its either b or c

explanation: