What is external conflict?

A. The struggle that happens in the character's heart and mind that
can't be seen by other characters

B. A device that authors use in order to force the action in a story
rather than letting events unfold naturally

C. A struggle between a character and something outside himself or
herself, such as another character, society, or nature

D. The development of a character's personality or attitude that takes
place over the course of the story