Which of the Following People Is Motivated by an Intrinsic

Which of the following people is motivated by an intrinsic factor?

A) Kim resolves to stay less active on social media for a month prior to her exams in order to get a good grade.
B) Though he dislikes sales, Roberto takes up a sales job hoping to become a manager in his company.
C) Jean works hard to learn a computer program she dislikes because she knows it can increase her chances of a promotion.
D) Despite her fear of heights, Donna begins mountain climbing because she loves the challenge of overcoming her fear.