Final answer:
Johann likely has a high level of self-efficacy in music due to his ability to easily learn music pieces and instruments, combined with the positive feedback from his music teachers.
Step-by-step explanation:
Johann's observation that he can easily learn music pieces and musical instruments, along with the recognition from his music teachers, suggests that he is more likely to have good self-efficacy. Self-efficacy is an individual's belief in their capability to succeed in specific situations or accomplish a task. This confidence in his musical abilities indicates that Johann perceives his goals in music as within reach and sees challenges in learning music as tasks to be mastered.
People with high self-efficacy are characterized by a positive view of challenges, a deep interest in activities they feel competent in, and a resilience to recover from setbacks quickly. This aligns with Johann's easy learning of musical pieces and instruments, implying that his self-efficacy in the domain of music is high. As such, the most appropriate answer from the given options is (d) Self efficacy.