The answer is the amputation of the lieutenant's arm. None of the other options are events in the story. The lieutenant returns home and we don't know the outcome of the battle. There is also no evidence he was ever ill.
C. include digital sources
d. word choice
a. synthesized
i tried but not sure what your directions or rules were.
Monet is a famous painter, and "Impression: Sunrise" is a paining: you can see it in the attachment. It was created around 1872-1874.