It is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security. So the correct option would be number 3.
" ...It is their right, is their duty, to throw off such government, and to provide new Guards for their future security.."
Explanation:
A social contract is an agreement between the people and the government. In this contract, the citizens agree to give up some of their rights. In return the government will protect the civil liberties of citizens by creating rules for all people to abide by.
In the social contract, if the government does not protect the rights of citizens then citizens have the ability to get rid of this government in order to replace it with a government that will protect its right. This idea is reflected within the excerpt above.
A social contract often relates to the legitimacy of the authority someone has over the individual. The relation between legal and natural rights also is a topic of social contract.
