Answer:
Yuri's behavior was a reflection of intrinsic motivation, whereas George's behavior was a reflection of extrinsic motivation.
Step-by-step explanation:
With intrinsic motivation, we choose to do something because of the personal rewards this action might bring us, the behavior itself is the reward. Yuri is an example of this type of motivation since he chose to take the psychology course due to his interest in the topic, the learning process will be the reward.
Extrinsic motivation refers to doing something because we can earn a reward from it, the main goal is to get something in return. George is an example of this type of motivation since he chose the psychology course to get a good grade and then boost his grade-point average. For him, the course is not interesting itself, but the grade he can get from it.