On the other hand if you're just going by the exact spot the person was born, then yes, that is in the modern-day country of Greece.
The only point that I was making is the point that I (thought I) stated clearly above, Alexander was born into an ancient kingdom that geographically incorporated both Macedonia and Greece (at least parts of). Different maps with different political agendas probably tell different stories about exactly how much territory of either was an integral part of the kingdom.
Not in dispute is that Pella, the city where he was born, is currently within the borders of Greece. So, as stated, if you're only worried about the exact spot, then the answer is Greece.
Alexander was born in the city of Pella, which was within the ancient Kingdom of Macedonia. At the time of his birth, the ancient Kingdom of Macedonia's territorial extent included land that would later become parts of the modern day nation states Greece and Macedonia.
The city of Pella is wholly within the current political boundaries of the modern day nation state of Greece. My understanding of the instructions makes Greece the most clear answer. But I can see how the instructions could be interpreted a different way.
If that still doesn't get my point across I'm sorry. I don't know how to be more clear.
We all know the the current nation Macedonia lies within the borders of the ancient Kingdom of Macedonia. But allowing Macedonia as an answer not only is factually wrong (it's not the current day nation where Alexander was born), but opens a road to many more dumb answers in this very same test: when Dalí was born the was part of Spain, when Van Gogh was born Indonesia was part of the Netherlands, when Sophia Loren was born Libya was part of Italy,...
So when you say "If you count the kingdom and not the city where he was born as the place where he was from... then Macedonia probably should be included" (your exact words), I reply that this would be "nonsense" and "an absurdity".
"Stalin was born Ioseb Besarionis dze Jughashvili in the Georgian town of Gori on 18 December [O.S. 6 December] 1878." -Wikipedia
Hmm . . . doesn't seem to quite add up . . .
Best Of Luck for the other quizzes everyone!