Final answer:
The correct answer is b) external motivation. Cesar's behavior is driven by external factors such as receiving an "A" in the class if he scores 43 out of 100 on the final exam.
Step-by-step explanation:
The correct answer is b) external motivation. Cesar's behavior is driven by external factors such as receiving an "A" in the class if he scores 43 out of 100 on the final exam. External motivation refers to performing an action for external rewards or to avoid punishment.