Correct Answer: The doctor advised my mother to take her medicines regularly.

Solution : The first option is the correct choice.

Narration Conversion:

• The verb advised replaces the verb said in the indirect form, as it is an imperative sentence, and the verb advised is used to convey the advice given by the doctor.
• The imperative form (take) is changed to the infinitive form (to take) in the indirect form.
• The second-person pronoun your is changed to the third-person pronoun her .

Therefore, the sentence in the indirect form is: The doctor advised my mother to take her medicines regularly.