Answer:
The answer is C.
Step-by-step explanation:
A-Gratitude for Mrs. Bentley, there is no internal conflict
B-The is no internal conflict, it just states how much easier life is with her around.
C-Thinking about the letter 100's of times is self conflict, "I thought about my decision a hundred times before writing this letter." This shows that she couldn't decide with herself on the subject of the letter.
D- This isn't a self conflict as she is not "fighting with herself". She is simple adding more detail into the explamation.
(Hope it helps, have a great day!)