Which scenario is the best example of intrinsic motivation?

Sarah's mother has promised to buy her a new outfit if she gets an A on her science exam.

Nico knows that when he finishes his homework he can play basketball with his friends.

Miriam works hard on her French homework because her ancestors were from France.

Felix is spending extra time on his presentation because he will get extra credit for adding visuals.

C. Miriam works hard on her French homework because her ancestors were from France.

Explanation:

Intrinsic motivation can be defined as a motivation that arises from one's personal interests, satisfaction or love for that job.

Unlike the extrinsic motivation, here, there are no outside factors, such as money, reward, praise, fame, trade etc.

Answer A. clearly shows that Sarah's motivation is new outfit

Nico's motivation for doing homework is permission to play basketball.

Felix's motivation is getting an extra credit and probably a praise from his teacher.

Miriam's only motivation is her personal interest, there are no conditions or desire for personal gain, only her own satisfaction.