Which of the Following People Is Motivated by an Extrinsic

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

A) Though most people find it difficult, Debbie enjoys learning Japanese because it gives her a sense of personal accomplishment.
B) Despite her fear of heights, Becky indulges in mountain climbing because she loves the challenge of overcoming her fear.
C) Kim decides to help her mother do the dishes after Kim is promised a candy for doing it.
D) Salma opted out of a corporate job and started her own business so that she could work independently.