To convert direct speech into reported speech, we need to make several changes: 1. Change the reporting verb: "said" becomes "asked" for a question. 2. Remove quotation marks. 3. Change the tense: The past simple tense ("did you buy") shifts to the past perfect tense ("had bought"). 4. Change pronouns: "you" becomes "I" (assuming the speaker is reporting what was asked of them). 5. Change demonstratives: "this" becomes "that". 6. Change the sentence structure from interrogative to assertive (subject + verb order, no question mark). Let's apply these rules to the original sentence: "Mr. Singh said, 'Where did you buy this car?'" Reporting verb: "said" changes to "asked". Question word: "where" remains. Tense change: "did you buy" (past simple) becomes "I had bought" (past perfect). Pronoun change: "you" becomes "I". Demonstrative change: "this car" becomes "that car". Now let's evaluate the given options: (A) Mr. Singh has asked if I can tell him where did I buy this car. Incorrect tense for the reporting verb ("has asked" instead of "asked"). "if I can tell him" is unnecessary and changes the meaning. "did I buy" is still in past simple and interrogative form. "this car" should be "that car". (B) Mr. Singh asked where did I buy this car. "did I buy" is still in past simple and interrogative form. "this car" should be "that car". (C) Mr. Singh asked where I had bought that car. "asked" is correct. "where" is retained. "I had bought" correctly shifts the tense to past perfect and uses the assertive structure. "that car" correctly changes from "this car". This option follows all the rules for reported speech. (D) Mr. Singh was asking where I had bought that car. "was asking" (past continuous) is grammatically possible but "asked" (past simple) is a more direct and common conversion for "said" when reporting a single question. Therefore, option (C) is the most accurate conversion. The final answer is $\boxed{\text{C}}$ Send me the next one 📸