Mark signed up for piano lessons to prove to himself that he could successfully master the challenge of learning to play the piano. What type of motivation is Mark displaying in this situation?

Answer: Competence motivation

Explanation: Based on the theory of competence motivation, motivation for achievement is the need to succeed, self-prove, achieve excellence, and is based on the personal sense of competence that people have. Each challenge is a motivation to master certain skills, to achieve success, and after each overcoming of the challenge increases a person's competence. Such mastery of a task, a challenge, can be an incentive to overcome a number of challenges and tasks that a person believes to be competent or able to overcome, and thus realize achievement, success.