@mitsuki48 I think what they are trying to say is that her thinking "is any of them from a country with strong magic" is wrong because ALL OF THEM are. Basically, they're saying, being from a country with strong magic is not rare, it's the opposite, being from a country like theirs where there isn't much mana, is.
Someone get me off of this "Noble Fiance Daughter Loved By Princes and Other Nobility" Train. I'm losing it. I'm getting overwhelmed by all the fluff and cuteness.