The correct answer is option 4, Abbe Sieyes. "What is the Third Estate?" pamphlet was written by Abbe Sieyes during the time of the French Revolution. In this influential pamphlet, Sieyes argued for the recognition of the Third Estate as the most important and representative part of society. He argued that the Third Estate, which consisted of the commoners and middle class, should have equal representation and influence in government as the Clergy and the Nobility. This pamphlet played a significant role in shaping public opinion and rallying support for the revolutionary cause. It challenged the existing social hierarchy and laid the foundation for the movement towards equality and democracy in France. Marquis-Lafayette, Edmund Burke, and Joseph Foulon were not the authors of this pamphlet.