The correct answer is option 3, Rousseau. Rousseau is the philosopher who gave the call "Go back to nature." He believed that civilization and society corrupt human beings and their natural state is pure and innocent. According to Rousseau, people should reject the artificial constructs of society and return to a simpler and more natural way of life. He argued that living closer to nature would lead to greater freedom, happiness, and moral virtue. This philosophy influenced the Romantic movement and ideas about the importance of connecting with nature. Plato, option 1, is known for his ideas about ideal forms and the theory of knowledge. Aristotle, option 2, is known for his logic and philosophy of science. Hobbes, option 4, is known for his social contract theory and views on human nature.