Yes, D indeed is the correct option. After people of third gp were irritated as they were the only one paying taxes (which was also a cause of french revolution), they decided to control the powers of king by establishing a fresh constitution to control his powers (this was due to a rumor that king louis 16 was about to further increase the taxes).

The main objective of the Constitution of 1791 was to establish a constitutional monarchy in France. This constitution was a significant milestone in the French Revolution and marked the transition from an absolute monarchy to a limited monarchy with a system of checks and balances.

Establishment of a Constitutional Monarchy:
The Constitution of 1791 aimed to limit the powers of the monarch and establish a constitutional monarchy. It sought to create a government where the king's powers were defined and restricted by a written constitution, ensuring that he would rule within the framework of a set of laws and principles.

Key Provisions of the Constitution:
1. Division of Powers: The constitution divided the powers of the government into three separate branches - the legislative, executive, and judiciary. This separation of powers was intended to prevent any one person or group from gaining too much control.

2. Legislative Assembly: The constitution established the Legislative Assembly as the main governing body, consisting of a single chamber with representatives elected by active citizens. The assembly was responsible for making laws and decisions on behalf of the nation.

3. Limited Monarch: The powers of the king were significantly curtailed. While he still retained a symbolic role as the head of state, his authority was limited to a suspensive veto, whereby he could delay the implementation of laws for a limited period. The king could no longer make unilateral decisions or dissolve the assembly.

4. Protection of Individual Rights: The constitution also aimed to protect individual rights and liberties. It abolished feudal privileges, ensuring equal treatment under the law for all citizens. However, it is important to note that these rights were not extended to everyone, as only adult male property owners were considered active citizens and had the right to vote.

Significance of the Constitution:
The Constitution of 1791 reflected the growing influence of Enlightenment ideas and the desire for a more democratic and accountable government. It established a framework for the rule of law, limited the powers of the monarchy, and introduced a system of representative government. However, the constitution ultimately failed to bring stability to France and was eventually replaced by the more radical Constitution of 1793.