Kannan said, "I wrote a letter".
AKannan said that he had written a letter
BKannan said that he has written a letter
CKannan said that he had been writing a letter
DKannan said that he wrote a letter
Answer:
AKannan said that he had written a letter
BKannan said that he has written a letter
CKannan said that he had been writing a letter
DKannan said that he wrote a letter
Answer: