Which of the following stories would most likely include the theme "an
individual's inner struggle against him or herself"?

A. Two people from different cultures fall in love and are able to open
the minds of their respective family members.
B. After many years of separation, family members come together
upon the death of the beloved matriarch.
C. A gifted general leads his army against an enemy nation and finds
victory despite losses.
D. A young wizard must decide if he will use his powers for good or
give in to the evil influences of his past.