Select the most appropriate indirect form of the given sentence.
“Oh, how could I ever thank you, Sir!” said the convict to the Bishop.

A

The convict told the Bishop that it was difficult for him to thank him.

B

Exclaiming gratefully, the convict said to the Bishop that he could never thank him enough.

C

The convict said to the Bishop that he could never thank him enough.

D

The convict exclaimed gratefully to the Bishop that how he could ever thank him.