Correct Answer: Reena told Rhea that she would not accompany her on that trip.

Solution : The correct choice is the third option.

In the original sentence, Reena directly quotes her words to Rhea using double quotation marks: "Reena said to Rhea, "I will not accompany you on this trip.'"

When transforming this into indirect speech:

• The verb changes from "said" to "told" in reported speech.
• "I will not accompany" is changed to "she would not accompany".
• Pronouns are adjusted to match the new context.
• Tenses are changed to convey the speaker's words in the reported speech.

Therefore, the indirect speech version would be: "Reena told Rhea that she would not accompany her on that trip."