Correct Answer: The doctor said to me, "Why have you disturbed me at this late hour?"

Solution : The fourth option is the correct choice.

The given sentence is an indirect speech, and we need to convert it into a direct speech.
The steps of conversion are as follows:

• The reported verb "asked" changes to "said to" in direct speech.
• The pronoun "I" (first-person pronoun) changes to "you" (second-person pronoun).
• If the indirect speech is in the past perfect tense, then we have to change it into the present perfect tense; therefore, (had + past participle form of the verb) changes to (have + past participle form of the verb).
• The assertive sentence changes to an interrogative sentence, starting with why as the introductive expression.
• The demonstrative pronoun "that" is changed to "this" in direct speech.

Therefore, the correct answer is: The doctor said to me, "Why have you disturbed me at this late hour? "