Hi, Mr. Abudllah Mahrouse,
Abdullah Mahrouse posted:Here, in direct speech, the noun "ONE" is optional because it's already understood from the context. But is it OK to say (Hana asked which her seat was)?
Thank you very much
Grammatically speaking, sentence (C) is grammatically correct because, as you know, when we report questions constructed with who/what/which + be + complement, 'BE' can be put before or after the complement. As for the necessity of using 'one' in (C), I think it isn't a must to mention 'one' in (C), just as it isn't necessary in (A).