The correct answer is D. He asked me where the post office was.
The sentence “He said to me, ‘Where is the post office?'” is a direct quote. In a direct quote, the words of the speaker are enclosed in quotation marks. The speaker in this case is asking the listener for information about the location of the post office. The listener can infer from the speaker’s question that he does not know where the post office is and would like to find out.
The other options are incorrect because they do not accurately reflect the meaning of the sentence. Option A, “He asked me that where the post office was,” is grammatically incorrect. Option B, “He asked me where was the post office,” is also grammatically incorrect. Option C, “He wanted to know where the post office was,” is a paraphrase of the sentence, but it does not accurately reflect the speaker’s tone. The speaker is not simply curious about the location of the post office; he is asking for information in a direct and unambiguous way.