Answer:
When the sniper examines the body he discovers that he has killed his own brother.
Explanation:
B. A possessive noun should have its instead of it's (which is a contraction for it is).
For A. Diana is a singular noun and the apostrophe should come after the r instead of after the s.
For C. The duck would've dunked ITS instead of IT'S beak since it is possessive.
For D. You do not need to put an apostrophe since theirs is already a possessive noun.
Answer:
I think that the reason for Rainsford's change is because in the beginning is that he showed no care for the animals that he hunts. And now he shows remorse.