Navy, trade (second could be multiple things)
D.
Athens.
Athens were more of a lenient type of city. They respected the morals and values of people and let their people focus on education and tradition, unlike Sparta.
I would say that these ideas most likely appealed to so many people because t<span>hey promised a way for people to end worldly suffering.
People were sick of seeing other people, including themselves, suffer every single day in this rotten world, which is why they wanted to seek help somehow. They managed to find it in Buddhism, which recommended walking down the rightful path in order to end suffering and pain.
</span>