> Use o in begin of these questions phrases
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>> A:
> B:
> A:
> B:
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> From what I know, the work as a honorific of respect, then, it is used only in formal phrase. But, this phrases do not seem to be formal.
These are meant to be put on the nouns, and , and is nothing to do whether it's interrogative.
This kind of (and basically for _kango_ , or sometimes it's to do with customary, likely for the easiness of pronunciation) is for the purpose of politeness. They makes the _standard language to talk to people_ , equivalent to style. They are called {}.
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We also put to nouns even when there's no need for paying any respect, and these cases are called {}. All these, now-a-days, are after all about how you want to present yourself; you can create good impression of yourself if you choose to use these words.