to get a message across to the audience and such things as certain themes they want to raw attention to.
The answer is either A and if not its B forsure
Conflict is the base of the story. Without conflict, the story has no plot, the characters don't experience anything, and there isn't really any developments at all. As for the second question, I think that's your own opinion.
The struggle or clash would be the conflict(C) because conflict is a disagreement or a clash of ideas.