The correct answer is: D. You said to me that she is my sister.
The sentence “You said to me, ‘She is my sister'” is a direct quote. In a direct quote, the speaker’s exact words are reproduced, using quotation marks. In this case, the speaker is saying that the person they are talking to is their sister.
The other options are incorrect because they do not accurately reflect the speaker’s words. Option A, “You said to me that she was my sister,” is incorrect because it uses the past tense. The speaker is saying that the person they are talking to is their sister, not that they were their sister. Option B, “You told me that she was your sister,” is incorrect because it changes the speaker’s identity. The speaker is saying that the person they are talking to is their sister, not that they are the sister of the person they are talking to. Option C, “You said to me that I was her sister,” is incorrect because it changes the subject of the sentence. The speaker is saying that the person they are talking to is their sister, not that they are the sister of the person they are talking to.