Answer:
Correct answer is Thomas Hobbes.
Step-by-step explanation:
Thomas Hobbes is the correct answer as he lived in the 17th century and expressed most of his attitudes in the book called Leviathan.
All other answers are not correct as other mentioned philosophers were not living in the period when the Civil War happened. Voltaire and Montesquieu were not even born, and Locke was only a kid at the time.