Who was the Classical Greek thinker known for his philosophical dialogues, contributions to mathematics, and for establishing the Academy in Athens, the earliest higher education institution in the Western world?

Explanation

A. Plato was a renowned Classical Greek philosopher, mathematician, and author of philosophical dialogues. He founded the Academy in Athens, recognized as the first higher learning institution in the Western tradition. B. Aristotle was a student of Plato but did not found the Academy. C. The statement about Socrates being unsympathetic is incorrect and irrelevant. D. This option is invalid since the correct answer is provided.