Correct Answer & Explanation
Option A
To convert an imperative sentence into indirect speech:
• The reporting verb 'said to' is changed to an appropriate verb expressing the mood of the sentence, such as 'ordered' or 'commanded'.
• The conjunction 'that' is not used; instead, the imperative mood is converted into an infinitive using 'to + verb' (to call).
• Therefore, option A is grammatically and syntactically correct.