Correct Answer: They told me on the telephone that they would wait for me if I was late.

Solution : The correct choice is the second option.

The indirect form of a sentence involves reporting or conveying what someone else said without directly quoting their exact words.

The steps of conversion are as follows:

• "said" would be changed to "told".
• "You" (third-person pronoun) would be changed to "me" (first-person pronoun).
• "If you are late" changes to "if I was late" to maintain the structure and perspective.

Therefore, the indirect form would be: " They told me on the telephone that they would wait for me if I was late."