Final answer:
Montesquieu, Beccaria, Rousseau, and Voltaire were Enlightenment Thinkers who authored the provided excerpts, focusing on themes of liberty, moderation, social contract, and religion.
Step-by-step explanation:
Excerpt #1: The Enlightenment Thinker who authored this excerpt is Montesquieu. He argues that when the legislative and executive powers are concentrated in the same person or body, it threatens liberty because it could lead to the enactment and execution of tyrannical laws.
Excerpt #2: The author of this excerpt is Cesare Beccaria. He suggests that people tend to support harsh laws but when they become subject to those laws themselves, they realize the importance of moderation. It is in the self-interest of individuals to have moderate laws to prevent harm.
Excerpt #3: Jean-Jacques Rousseau authored this excerpt. He states that the main problem is to find a form of association that protects the individual's person and goods while allowing them to remain free. According to Rousseau, the Social Contract provides a solution to this problem.
Excerpt #4: The author of this excerpt is Voltaire. He argues that virtue is only possible in a state of liberty, and coercion undermines virtue. Voltaire also contends that even the sovereign does not have the right to use coercion to force individuals into religion, as religion requires freedom of choice.
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