Peyton's Management Professor Just Told Her Class That the Final

Peyton's management professor just told her class that the final exam is optional for students like Peyton who currently have an A. Peyton decides to take the exam anyway because she likes the subject and wants to master the material. Peyton is motivated to take the exam by a(n)

A) hygiene factor.
B) physiological need.
C) high need for power.
D) extrinsic reward.
E) intrinsic reward.