Read the sentence from poe's "the black cat."

"it was this unfathomable longing of the soul to vex itself to offer violence to its own nature to do wrong for the wrong's sake only that urged me to continue and finally to consummate the injury i had inflicted upon the unoffending brute."

which theme does this sentence best support?

a. no wrong will go unpunished.

b. humans are to struggle against their fate.

c. all people have a wicked side.

d. man is meant to rule earth.