Learn English – Sorry, I didn’t recognize “you”, or “your voice”

Civil discourse rests on the cooperative principle, and any response should rest on the assumption that your interlocutor is following that principle.^† Whatever your private opinion, your public posture should be that an inappropriate or irrelevant Comment derives from a misunderstanding of your Question.

And for that no one can be held responsible but you, the writer. I have written elsewhere on this site about what I call The Adamantine Law of written English: “Anything which can be misunderstood will be.” As a writer you control the discourse you launch, and it is your task to forestall any misunderstanding.

Consequently, the most accurate, effective and courteous response is one which begins with something along the lines of “I see I have not made myself clear.” You may then clarify your meaning or scope or context in whatever way the situation calls for.

And it would be a graceful and responsive conclusion (not to mention a courtesy to all your readers) if you could say at the end of your response that “I have modified my question to reflect this.”

^† _{A comment whose diction or tone clearly forbids that assumption may be ignored or flagged, or both—but that is another matter.}

The most appropriate answer is

D. Thank you all the same.

Because speaker B was polite, and apologized for not being a local resident, speaker A acknowledges his/her kindness by responding politely, too.