Select the most appropriate indirect form of the given sentence.
"Oh, how could I ever thank you, Sir!" said the convict to the Bishop.
1
The convict told the Bishop that it was difficult for him to thank him.
2
Exclaiming gratefully, the convict told the Bishop that he could never thank him enough.
3
The convict said to the Bishop that he could never thank him enough.
4
The convict exclaimed gratefully to the Bishop that how he could ever thank him.