Question

How was the Estates-General useful in uniting France under one national identity?

It allowed members from different social classes to enforce taxation laws and challenge election results.
It allowed noblemen, clergy, and townspeople to serve together as a legislative body in the French government.
It gave equal voting rights to all social classes in France, including the noblemen, the clergy, and townspeople.
It provided a way to deny privileges for the wealthier groups of people, resulting in a more unified nation.

Answer 1

im a bit late but its B 

Answer 2

I believe the answer is: It allowed noblemen, clergy, and townspeople to serve together as a legislative body in the French government.

By allowing this to happen, all segment of the french population could give their aspiration and influence the type of laws that can be passed by the french government. This create a bigger sense of unity among the French people and make it easier for them to mobilize under one national identity.