I said to the receptionist,"I want to be woken up at 6:30 tomorrow".
Convert into Indirect speech:
The two ways of relating what a person has said are 1)direct and 2)indirect (reported).
In the direct speech, the exact words of the original speaker are repeated.
In the indirect speech (reported speech), the exact meaning of what the speaker told is expressed but not necessarily in the speaker’s exact words.
Option D is correct as the appropriate introductory verb 'told' is used, appropriate conjunction 'that' is used and the given sentence is in the simple present tense so the reported sentence uses the past tense (wanted to), and it ends with a full stop.
Options A, B, and C are not correct as 'said to', 'want', and 'he' cannot be used respectively.
The correct answer is D) I told the hotel receptionist that I wanted to be woken up at 6.30 the next morning.