Which philosophy reviewed in Sophie's World is most commonly applied in the modern world?

Question

The List:

The Natural Philosophers, Democritus, and Fate

Socrates, Athens, and Plato

The Major's Cabin and Aristotle

Hellenism and The Postcards

Two Cultures and The Middle Ages

The Renaissance and The Baroque

Descartes, Spinoza, and Locke

Hume, Berkeley, and Bjerkely

The Enlightenment and Kant

Romanticism and Hegel

Kierkegaard and Marx

Darwin and Freud

Answer 1

Altruisim good against evil - Hume,Kant,Marx