Justine was interested in learning how to play the piano. she has successfully passed every level of music book and is planning her own concert. what stage of ability development is justine at?
a. novice
b. apprentice
c. master
d. mentor

The stage of ability development in which Justine is c. Master.

Explanation: Justine's stage of ability development is "Master" because she is unconsciously competent. In other words, she can show her ability without doing an effort. Moreover, Justine can be considered a "bona fide virtuoso" because she has already passed every level of music book, that is to say she has already learned all the techniques. In that way, as Justine has become a skilled pianist, it can be said that her stage of ability development is Master.

last one is the answer

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