The answer is D because that's the best example
The correct answer is universal truth.
Universal truth is something that should be known to everyone, regardless of their nationality or upbringing. The idea that love conquers all appears in many texts, and it is something that most people, no matter where they live or how old they are, believe in. Therefore, it applies to every nation, and is thus universal.
A great intellectual and cultural development in Europe and the United States is the source of many discoveries, inventions and revolutions, for example: Declaration of Independence of the USA or French Revolution. It's also the time of philosophers - like Montesquieu, Voltaire, Jean-Jacques Rousseau, Diderot or d'Alembert - who all focus on the same subject: the questioning of political structures and traditional value systems such as religion, absolute monarchy, education, science etc.
