I meant: Could one say that the hot air balloon was invented in China?Yes, that's fine.
You need a capital T in the. And it's balloon (two ls), not baloon.
Understood. Since you'd italicised everything after "Could one say", I thought you were asking about a sentence starting "The hot air balloon...", which is why I said T needs to be capitalised.I meant: Could one say that the hot air balloon was invented in China?
Yes, this is fine, or the option I suggested in #2.I think I ought to say: Was the hot air baloon invented a hundred years ago?,