Ockham's Razor. I think. I don't really know much about this though
Greece had superior general
They have less security to cover the borders and more land to cover, making it easier for intruders to enter and take over of some kind
Both want a change from being ruled by an absolute ruler, both have economic instability from war debt, both have social inequality. And also, both started because of enlightenment ideas.
Answer:
a is 1.
b. is 2.
and c is 3.
BTW, this is not a guess.
