Why did tax proposals and the voting dispute become important together in the Estates-General?

Approval of representatives was needed for taxes, and the Third Estate wanted fair voting

The governing concept is the connection between taxation, representation, and political legitimacy. France’s financial crisis forced the monarchy to call the Estates-General and seek approval for new taxes. The Third Estate accepted that the country needed revenue, but it argued that fair decision-making required voting by head rather than one vote per estate. Under the old arrangement, the clergy and nobility could combine to defeat the Third Estate two to one. Thus the tax problem exposed the weakness of royal finances, while the voting dispute exposed the unfair political structure. Option A correctly links both issues; B, C, and D contradict the situation in 1789.

This is a Class 9 History question. Chapter: The French Revolution. Topic: The Outbreak of the Revolution.