Correct Answer: (4) Aparna told me that she had been dancing for two hours
Solution:Reported speech present perfect continuous tense में है। अतः इसे past perfect continuous tense में बदला जाएगा क्योंकि reporting verb past tense में है। Pronoun 'I' speaker के अनुसार 'she' में बदला जाएगा। अतः option (4) सही indirect form है।