Correct Answer: Rohan said that he would arrive late.

Solution : The correct choice is the second option .

Indirect speech focuses more on the content of what someone says than their exact words.

The steps of conversion are as follows:

• There would be no change in the reporting verb.
• The first-person pronoun "I" is changed to the third-person pronoun "he".
• The modal "will" is changed to its past form, "would".
• The connector "that" is used to introduce the reported clause.

Therefore, the correct answer is: "Rohan said that he would arrive late."