Fill in the blank with the most appropriate word.
"Open your mouth." The dentist told me __________.
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 dentist tells the listener to open his (the listener's) mouth.
Options A, B, and C are wrong as the listener is not instructed to open the dentist's mouth, the instruction is in the simple present tense, and 'to' is not used respectively.
The correct answer is D)to open my mouth