The correct answer is A.
Alexander III of Macedonia, also known as Alexander the Great, was an ancient Macedonian ruler and one of history's most successful military commanders. As a King of Macedonia and Persia, he established the largest empire the ancient world had ever seen.
During his youth, he was tutored by the ancient Greek philosopher Aristotle till the age of 16. Aristotle got him interested in literature, science, medicine and philosophy.
Aristotle was appointed as the head of the royal academy of Macedonia. He gave lessons to Alexander and two other future kings: Ptolemy and Cassander. He encouraged Alexander to conquer new territories and to be 'a leader to the Greeks'.