The correct answer is: I told her that I would have written letters.
The original sentence is in the Future Perfect tense, and when converted to indirect speech, it becomes the Future Perfect tense in the subordinate clause, with the verb "would have" indicating the hypothetical or uncertain nature of the action.
A. The Hyder said that it gives him great pleasure to be there this morning
B. The Hyder said it gave him great pleasure to be there that morning
C. The Hyder said that it gave him great pleasure to be there that morning
D. The Hyder exclaimed with joy that it gave him great pleasure to be there that morning
Explanation
The correct indirect speech for "The Hyder said, 'It gives me great pleasure to be here this morning'" is: The Hyder exclaimed with joy that it gave him great pleasure to be there that morning.