What is character motivation?
a. a character’s ultimate desire or goal
b. the struggle between forces in the plot
c. the force that brings conflict to the protagonist
d. careful and deliberate word choice in writing

A. a character’s ultimate desire or goal

Explanation:

In a story, character motivation is a character's ultimate desire or goal, is the force that drives them to behave in certain ways. Every interesting character have a motivation that also gives them credibility, for example, in the novel To Kill a Mockingbird by Harper Lee, Atticus' motivation is to be a just man that does the right thing and sets a good example to their children, and such motivation drives him to defend Tom Robinson in a trial, a black man who, unjustly, had been accused of raping a white girl, and because of his motivation, his character is more believable and the readers can sympathise with him.