Alexander The Great's most enduring achievement was to what?

Yes, from the 4 mentioned i would also choose D. However the reason for Alexander's exploits were not political but personal. He wanted to outdo his father Philip II in all possible ways. His conquest,though of great genius, was made out of pure hubris. Alexander considered himself the son of a God ,since early childhood- he was told so continuously by his mother Olympias.His was a quest for recognition by others but most of all by himself.